Malicious PDF — malware analysis report

Static analysis result for SHA-256 2df0695c629ff279…

MALICIOUS

PDF

74.8 KB Created: 2021-09-04 03:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f6e0d1be1fd16bb9deefdbcf682dfcac SHA-1: c91caa5814b4f35d24111a706bda165c866991ee SHA-256: 2df0695c629ff27903ee09536b9cfae985046d400ee0a2cd020344f00ebbf689
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various websites, including those hosted on compromised WordPress installations. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to lure users to potentially malicious sites for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://alajuusa.ee/media/contents/file/togevasafitunafotuwuf.pdf In PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/ninuvobexumememeroku.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/30301542633.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/95932725888.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160bc86c546289---pagimutotexodomokor.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/3486965251.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886ba841a6e---15693541207.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c624b4cac14---34015232053.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/71123747865.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c37c402a4---pevisokuvogozovib.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/kapipejunakiwepi.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/92975946987.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072077b5eb96---842019366.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/43531605082.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/talexukitulagodetusu.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/febunajodukifik.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/gikenojuz.pdfIn PDF document text
    • http://axwelindia.com/uploads/48998141721.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/30488d7ba694f297f1d0a0d9704714a0/36738324123.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/48959562063.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/kokepot.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/69746307353.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b15c2506356---pulutegibumok.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/rrnmrd69jm3ru3n8ln5cvd7h07/96264410531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=amazing+grace+piano+notes+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABD 16132 bytes
SHA-256: a7da16955b4e305bdefa886f58fbe42edc5334414e693d86bb5c5ed494e745d8
font_02_sfnt_off00010409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10409 10960 bytes
SHA-256: 150c1234aa10b5d633b5801d20cacd1ca7deb7755364dd54c0efe3a175f78f29

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