Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd837acd6ca88839…

MALICIOUS

PDF

81.2 KB Created: 2021-08-07 06:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cf4e72a8ba47bee010b493d86d0b710d SHA-1: cc2ef1ee04852ae0b05c10b553cb90183cdd87fa SHA-256: dd837acd6ca888396bbe67aa6c0a6bb592f38ada15bac030375fca3711c8edba
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure are consistent with attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://philabc.ru/uplcv?utm_term=bajar+pdf+comentario+biblico+historico+alfred+edersheim PDF link annotation
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609238de594e4---91632171135.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/godofodepo.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/3rp4hq98nvp3vdm9hpeth97tai/pifekutilo.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/87153803741.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/592512530.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b456750af9c---92937306429.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/c7715c15e5495bf17bee65b306ea39ee/3230493882.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/98234351378.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/jibadi.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/15647876010.pdfIn PDF document text
    • http://proxima-online.it/public/file/48376542208.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d35a9e9e8---31757198490.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aafbb26efc8---vasofipesujetizutigok.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/90207218404.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bb046d644---95189724072.pdfIn PDF document text
    • https://angkalaris.com/contents//files/98557957185.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/rujexufupurebotukaj.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/sepowukirozinasozipirirow.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/a2538d0bae19484e09c8903dfc54c559/subiroxovoneteged.pdfIn PDF document text
    • https://istanajp2.com/contents//files/xopalapikadalo.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cef1adae4c---zajojijujesi.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8538ad0cfe---jevoripakup.pdfIn PDF document text
    • 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_off0000d2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DC 18604 bytes
SHA-256: 81f24c5fa02895ab976d45dca702814899a1bed48b8ddd3f0ce0a6e3058d0995
font_01_sfnt_off000102e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFF 11208 bytes
SHA-256: 37e49006761416c250fb0f7acb6996e8f5678bf9185cd396b600e53361773d8d

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