Malicious PDF — malware analysis report

Static analysis result for SHA-256 640d0d2766284523…

MALICIOUS

PDF

97.2 KB Created: 2021-06-30 18:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 27b47d8ecbd1fcce35747ef89d57733e SHA-1: 0a9d5e487c135af6989a86bfd71ad620467eb033 SHA-256: 640d0d2766284523491447cef883f747a49d44f71d6efae24810aaaf68f60377
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites hosting PDF files. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may instruct the user to open a password-protected archive, a common tactic to bypass gateway security. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the link farm structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/19b5b96522f190ab37d6c6e7b7e21913/gomanigug.pdf In PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/h3ke76af21vb8cc5v406do00m4/18273638742.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/birubetenoruxaruge.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/v92ogthtp39523527tvhm7t2fc/moliwanogovizozimufew.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/5056368914.pdfIn PDF document text
    • http://aiaciran.org/cache/fck_files/file/22010810968.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/59cfda189e4f79170b142ef36facfa8d/tibudafikamupas.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/k8h2cu8moeafpaslgu3eiqu2tj/kunuzagovulewopozerimos.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/93566182637.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/55072043852.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/14885004799.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/a07fd5c770ceef6a6a9c60600a8e6362/mupimazurenebezosufol.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/907a288d3db4f3eed7fb8479ad920605/nabiligorevibituxep.pdfIn PDF document text
    • https://topupdana.com/contents//files/58503818350.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/cf39qe4cfast2104kcejmescs3/13821288030.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/54047616070.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082d88535000---zepuna.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/0jcmpdhgds17oa7h8a3c1edmpv/kubofe.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/2106251821588048318668s2.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/702c0f371dcbdc2f6060fa1709ce888f/bikituboxakobugugata.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/881c0f33daafe7f23a9a14d9701e27df/golevipamina.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609070aaad948---wigilebofiruwurunidadimu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=machine+elements+in+mechanical+design+4th+edition+solution+manual+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010f04.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10F04 20672 bytes
SHA-256: 151fe55251e190cbbdb1a34aed1a1707063edacad1216b8d1f182f973be73f7c
font_00_sfnt_off0000f6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F3 16484 bytes
SHA-256: d273aa07ff8a489a911984db44408417f350911f610808c8fac3d27abc1d63ef
font_03_sfnt_off00015ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CE5 11140 bytes
SHA-256: 8232d8763dd0a2a4647ffd6a1e947c96ca5c3c0e2666c98d561351bb3d9bbd34

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