Malicious PDF — malware analysis report

Static analysis result for SHA-256 a47b32f5e5607625…

MALICIOUS

PDF

96.8 KB Created: 2021-07-02 07:41:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7c7ff867a019a3e408bfef33b1bc6f7 SHA-1: 377d7ff1094b806ecc9a88528a8a3afa76858e20 SHA-256: a47b32f5e5607625ea45462cb1a52ecf127d9a6c1c672ece5a2dee479fd943e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It functions as a link farm, containing numerous embedded URLs that point to compromised websites, likely intended to lure users into downloading further malicious content or submitting sensitive information. The presence of multiple external URIs and a link farm on disposable hosting indicates a deliberate effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://infrive.ru/uplcv?utm_term=checkpoint+maths+3+answers
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/b6228ac4d95ffa1b07d355e959e1c714/vozoxafipaxebofawejozib.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/6e2841bf09838a24f75403d2ec8c6ab7/tujovepawexanugitimu.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa951543e77---zedanodowesuwit.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/51369656083.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adb5c2e826c---fewisedomelajekalitu.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/0f80874657e33d4a852ac274e479ab49/29007761629.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8946bdb29---faxapokemoz.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3cd7439303---41492211235.pdf
    • https://papiratisk.cz/soubory/zabudaxepewaxotikiked.pdf
    • http://chinalanpa.com/images/upload/File/rumifesobusafewenuw.pdf
    • https://abe-rdc.com/userfiles/file/wamemisutefarojelufuwejis.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/af221588a0504153579d70a3e8c34b8c/godolovowixurukexanakaguk.pdf
    • https://bd-sokolovska.eu/userfiles/file/vutikoveneralakitederirav.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/41821374964a630af51deccea48e79f5/dejidezupopojizoseravi.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e5e54a71a---kuxofufiselu.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/ed09e67a6badcb975c880b69107ee126/tizido.pdf
    • https://fontaine-eva.fr/userfiles/files/nonugafebejuwijavig.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/c50cee9311f2b8fc7f53bd2ff5cb9ad2/jevunesixofomet.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cb43eaabd---55475894871.pdf
    • https://phuketwebstudio.com/ckfinder/userfiles/files/depupenorenazolol.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160784eb42dc4b---42095510080.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc83.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC83 16792 bytes
font_01_sfnt_off00011495.bin
33a5b365f19421b165a1ce7be6282e2dc182bfde58fa3acaf24718c067b3c6f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11495 19332 bytes
font_02_sfnt_off00014732.bin
d21c2a030176d04af7b33a6ae0b16f9243fcbbe25d975f3d301076af46ac91f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14732 10976 bytes
font_03_sfnt_off0001609b.bin
86e84c66d8d6f41aa4fd4ca3112cd9676e96dc3ca2bc086eac79e8f8eb451e33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1609B 16084 bytes

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