Malicious PDF — malware analysis report

Static analysis result for SHA-256 efccb44f88e4fda2…

MALICIOUS

PDF

90.2 KB Created: 2021-07-25 01:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a554ec2d4e242194a05b6d4303c9403b SHA-1: ba5cfc65cd1ddb8a92b3c24c87e95145ff577372 SHA-256: efccb44f88e4fda2ca621886bab1651bfb08f7ab316269fdd06d05ef6e348ed3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple PDF link farms pointing to compromised CMS uploads and disposable hosting suggests a phishing or malware distribution scheme. Although no scripts were extracted, the PDF structure and embedded URLs are indicative of a phishing lure, potentially leading to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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 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://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/15279a659082e8a1643c01e911417b60/sidawofoxogajutera.pdf In PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/72450819778.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb8d1cb1b1---7162192137.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160763b560f97c---71539631957.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/cbd3ffc98a68ce971f69baf80070899b/80489641505.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202162885263110.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7afd55926ad8e1831b101e8343083a1e/6293608249.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/a7674e01a021d399e27bcca6018ac822/85764547950.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829dbf1bbfb---fawoduvekurolupera.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/64999373414.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/45631528559.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/6698d731dc489ae874b12a63caab3ee5/pagisatawizedol.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/32452313962.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/nagawotakax.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c271fa41af5---39602572402.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/a67db03a84efdef106929f4e08a9d5e2/94037527010.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789d45d02dd---65356279367.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/jd7uocanj9mt4v5cibcop5mju7/95009290681.pdfIn PDF document text
    • https://webmenuplus.com/images/file/xezoluwutezas.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab00064596a---nazekofosenizetupajil.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/37146998845.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/mabigovod.pdfIn PDF document text
    • https://ridersshop.it/file/95087398335.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/r1vspnssrbjeb4jkusfhihpq7m/57280622784.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/dikibep.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1623485041.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/e22cde022d47d4425bceea8e4dfac0ca/lupokukigifuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=download+dragon+ball+z+shin+budokai+3+psp+isoPDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AA 11092 bytes
SHA-256: 15967e2da2b3a14775a2b94c69938141adbfb91d926e05f50bfc12151d72ad9c
font_01_sfnt_off00010d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D16 21080 bytes
SHA-256: 9a47981dd54ab32e5febb75d19c45353a52817dccbf4a56c45ce827209d0329d
font_02_sfnt_off000141a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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