Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b8f793ba08116f…

MALICIOUS

PDF

83.9 KB Created: 2021-09-05 16:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cdc2c7052944299a9a554e025afe8a49 SHA-1: 3cb59543a782870120363e35a2ba360018b54be5 SHA-256: a1b8f793ba08116fb8219bc715ef1bc683272f068042cfd9d4a99282a13c8ff5
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, many of which are WordPress sites using the Formcraft or Super Forms plugins, suggesting a link farm attack. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malware or engage in phishing. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704dbcbd059---dolupenijatenege.pdf In PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/6p5vv3907epefcp3okoh097240/53557536351.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/4962efe08de4048495271a94eb5abc97/ripusizujikofigas.pdfIn PDF document text
    • http://contextuae.com/resimler/files/2013491934.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ee69dca6131---25045583378.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/5945637520.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/73273336645.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/virusulotefil.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161255db111187---zidepenitinazera.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160903f14154a0---pitamegusazu.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/80427130250.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5012e79fb0---kevegevuduluruguv.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/xekepokuzakusukojiwa.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/89422714067.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/senawosoxojefudi.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/fexexoberimukoges.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/91505970627.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/xalolon.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/75278824277.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/verazugoragiwevo.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/dcfffe95125fbeae3c56ff6151868aa3/degumedebuvidarerez.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4331ebd402---680877504.pdfIn PDF document text
    • https://agermag.ro/mm/file/larozumexas.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/98418516518.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=world+happiness+index+2018+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_off0000e1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BD 17972 bytes
SHA-256: 23a5fbaea89eacdf39ba315f20c181976394170a16c5f11affbc079147e2ac49
font_02_sfnt_off00012824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12824 11096 bytes
SHA-256: dbb52177b5ede903f4e3860ddb3a0be38e22cc2cf6fc971b12f372a42d336360

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