Malicious PDF — malware analysis report

Static analysis result for SHA-256 844811cd55c2346d…

MALICIOUS

PDF

101.1 KB Created: 2021-06-29 14:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fbb3d4bc2ad756cde477f408ffcbea09 SHA-1: a156b55a068569421cd8f76e781751c0e1c9cd86 SHA-256: 844811cd55c2346d3b7757ddde21ca447ed3ab0b3f431271a40ee05d963a1744
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this, aiming to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://queure.ru/uplcv?utm_term=questions+in+spanish+to+get+to+know+someone PDF link annotation
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53c6e79fe8---59019888088.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/dotuvipifoxigixizal.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/v6725lej9ubmtdomnojech9rb7/96568702285.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/58889377658.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/t4ov9npsr7bhvrjs96c2eb82u7/luvowuxef.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/342459f006a72422218263f843e64476/1062445654.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab75526fd3e---36747335302.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa295a6645---27284041042.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/57088025206.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12a91cb89e---76809314240.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/40491848059.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/l1g6unr01rpgvfsma5a6c5mo12/popaxelumuzizagewo.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093e76e258aa---natuwuguluxisuduxibubal.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/73149e4fc06f8a890ff93811401b54e1/tepapizosokiferavinor.pdfIn PDF document text
    • https://khanikango.in/file/13909110682.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/97151088082.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/wedoxodajonavixawi.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/44550582574.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e57d8e72de---xelagivumobo.pdfIn PDF document text
    • https://warungmimpishio2.com/contents//files/79827309639.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c57a79759fa---66777663009.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/ad9a91f8dc86e5da36864877a66e44a4/93081602581.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bea1cee2e7---wopupagagisufog.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/7127979963.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7E 10888 bytes
SHA-256: e4c361cd44629c2434a5b3aa7607665def29395536916afd715975b33346684f
font_01_sfnt_off000127ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AE 18736 bytes
SHA-256: 16c31d2314615ca033a1d9b27bac69f898a839debf09da00380c7e926514291b
font_02_sfnt_off000157aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FBB 16620 bytes
SHA-256: 7307651ed740d196879e946f7ecab9c3d4f077ce7b5411ae0a26660fb50324f3

Open this report in the interactive analyzer, or submit your own file for analysis.