Malicious PDF — malware analysis report

Static analysis result for SHA-256 55db87ff2c87e68a…

MALICIOUS

PDF

92.8 KB Created: 2021-08-08 21:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d4717feaca0556641997d9d556239c5e SHA-1: ffb3c32dc2e0b00fb590b0591541e8b7c0a558d7 SHA-256: 55db87ff2c87e68a483e8575d35142e8af856688d994998aa7917d6fd8809eb6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://asja.ua/userfiles/file/pipugebamuviloxisake.pdf In PDF document text
    • http://esistore.de/userfiles/file/lededijiz.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/20141789644.pdfIn PDF document text
    • http://zerosquareonline.com/file/31209050852.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/vawexaviruweweragewa.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/4b6ce2d76aebef8e19f42a40b56ff07a/89594904444.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/vuzevo.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/8bb2cfdad02f84a408f05c44ada9fafb/86245932242.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/0fc363b5b554e88438ad70df0a4f9b20/98088561264.pdfIn PDF document text
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/43226164972.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/dujugarametatejemudi.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/nipona.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/0phsm1ip2lv6amsnrrr4ep4pc6/nonugogeveledugexazoti.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079012bd381b---76953268361.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/35813364473.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/9e19335638376dec8cb88d47942cf91c/wewizobedemutovemuda.pdfIn PDF document text
    • http://rld-carbon.ru/file/56166487088.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607abf1f24c28---78541903924.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/08icr44e8j4phrlb9cepb3ggk7/bodode.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/puwebu.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2eaacf9a6---nitoxetarubimimatilijuvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=damon+ps2+pro+emulator+apk+%2B+bios+file+download+androidPDF 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_off0000fb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4F 17276 bytes
SHA-256: 9366604407cf7c3d2bfe39a1c4db41946676c4462b166209ca9fc56a9fb6db8f
font_01_sfnt_off00012879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12879 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14086 1760 bytes
SHA-256: 478d64aad58a46c60a63c2bd6d05d9c39068b35528f549688063ac651822ff24
font_03_sfnt_off000148e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148E2 11196 bytes
SHA-256: eaad4bc7cc01c81421fec42cdb54e75ae2260319d695f9cff79fb9e22272b727

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