Malicious PDF — malware analysis report

Static analysis result for SHA-256 c309db13e584f29c…

MALICIOUS

PDF

93.3 KB Created: 2021-09-01 05:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8e480be8e9933e61654098d7dbd96bca SHA-1: 1c2b333dfdd3e9f37b3af8e7c8108e6957f07f93 SHA-256: c309db13e584f29cd7a1e4f7b8738234487b4b7f70c4d612d09979030241858c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers identified this PDF as malicious, specifically flagging it as a phishing trojan. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the true destination and track user engagement with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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 http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/96373392054.pdf In PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6f781e33a---deduxisukejobatosobodus.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160deac2aeb409---22870542459.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/sixaxesigukixekokofusat.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ceec233a3---senajuzakefodexataw.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/93001765070.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/69900113534.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/jakiruvabobebejejoxum.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1612184d165565---gudituwubegezorek.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/levarurixekebafu.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/4063146072.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/xanida.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f31529e623---72985986161.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/sigifopaziwuwabomuzebek.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/niradudasoriguworanoz.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/75056429077.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/27153291973.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/v70b4ds84312fdopq2m6joule6/ronejozozanetivipal.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/91135731354.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/54917757298.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/28648526517.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/vudidofaburasuzegewu.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/e2b4c07e506ea0f325114a59806513a1/2308862237.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30802168461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=foxit+pdf+ifilterPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00E 16480 bytes
SHA-256: d41f4763bbb0fb5dbd70afa166453038fb30ae01f18245f1ea8a2ad9bc3c4c3d
font_01_sfnt_off0000f70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70B 10136 bytes
SHA-256: 9e5a32c88056c9cd3f14a4e404dbdeaa6cec7d53b17dd7aef9e79306c04f106f
font_02_sfnt_off00010dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000125da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DA 25632 bytes
SHA-256: ae26fb32e9c428cdfee3a58b0e134092de96d8cd6ecb8ea3b0ff5542474093c6

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