Malicious PDF — malware analysis report

Static analysis result for SHA-256 8889745498f8471a…

MALICIOUS

PDF

84.5 KB Created: 2021-06-29 15:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: edcc08d494a645c01cae63a58de1d814 SHA-1: f8ae4c06f3d0382c107f758d013359071ae5a52e SHA-256: 8889745498f8471a44b9b4cf47543fc75b51b26b55787b3cea212fd285a0b09d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan distribution vehicle. The document functions as a link farm, containing numerous URLs that point to compromised WordPress sites, which in turn host further PDF files. These links are designed to lure users into downloading additional malicious content, likely serving as a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3c43d7c7c---vilosejexo.pdf
    • http://bpsstudio.hu/uploads/kujigilusok.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/cg51glsnv8jn0hev7shuud8vju/timuzurut.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/923f468e10ce73866d3911979d5b9e1e/fafat.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3898a59ae---kusupavaredor.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/328fdec661dee5606cb23cf1c8ecd455/jajamazakejisi.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/blpj9gd4bvci3atqn3q4fffevf/vufijoxatiki.pdf
    • http://azizolace.cz/images/file/zarejebi.pdf
    • https://peilimineko.com/userfiles/file/7292210366.pdf
    • http://nwatchonline.org/userfiles/file/rafabiwifemenudob.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4ac8284ec---83394879915.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/d7f06086a04dfc274536971b7c21009e/60566700947.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/54f232b0a746ded5968801c75a6cd403/livuribusidelevanedena.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/51932903104.pdf
    • http://amon-syotengai.com/userfiles/file/86267508279.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d43fed227---kawiralezuxuro.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a50e60085f---gukolofenomozupid.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3d726abb8---tanovafitagavalogulijun.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/94232b5ca2d83f6463ea341c9047e993/guzilabadesolesebosolelub.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/11d8702c9c33efe2158253a807565345/44626220832.pdf
    • https://haltia.mx/sii/ckfinder/userfiles/files/zojivaraboxoxejo.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/4b6d2af90126d4f61a1a666dca8edbc1/botosiredidugibajefufe.pdf
    • http://sugarfree-gelato.com/upload/file/netukosizalojofuvufekon.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/c6e60ab2e0a4eba1a467745d9796897f/21861297903.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=first+pneumococcal+vaccine
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e788.bin
ef7bf8957f691f656b8b6da02b86f9d1d8a714af42c0b9ae53d749d68b4cf4b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE788 10676 bytes
font_01_sfnt_off0000fffc.bin
b99e34d8a4096e8b835cec90e3ba4be2644883ecc06b11b5289ce712eff1971e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFC 17176 bytes
font_02_sfnt_off00012d08.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D08 16792 bytes

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