Malicious PDF — malware analysis report

Static analysis result for SHA-256 db38268d64b47b0e…

MALICIOUS

PDF

75.0 KB Created: 2021-08-10 16:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: dcc4055a245c1a69a8470bf3d81020af SHA-1: 0c00fec471c2ab227b4180331269fa78fceb7c93 SHA-256: db38268d64b47b0e3159caa1d1690a2aac39711d80f36faa0e0c71b4cb5b32b1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious sites. No scripts were extracted, but the structure and URL patterns strongly suggest a phishing or malware distribution vector.

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://cleangroupbd.com/ck/upload/files/7996920468.pdf In PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161077edc7e5e9---ziruxapurolutuxofewipokif.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/6kou4ifn9fmdb7thhqavbjpe00/32461143354.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870220eede1---dolizosakonefubabetomugep.pdfIn PDF document text
    • https://hsse.cl/files/86393610795.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca20b6e558---35058880198.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/duzixufinowusofegadutedaj.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/037b98966980021ecfea64045ee1de41/63955032651.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a811b50639f---tuxawelapudogefez.pdfIn PDF document text
    • https://cdpu.net/wp-content/plugins/super-forms/uploads/php/files/e32ebdefb550fe15365fc02977120f4a/tezefabeb.pdfIn PDF document text
    • http://waberry1969.com/clients/877040/File/gujijupoveredofepibi.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160898991cbd32---sekifejuzifopato.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/79935767845.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/bilorumudejafojakinofon.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/62f26bdd705eda92be79f0b5c9e1eafc/zafegigosidojalalut.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c931fbb56b---tewagafuvuj.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/kovanifexelar.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/pacoe61lts9tesvcmqevr6gclg/76301722632.pdfIn PDF document text
    • http://accronline.com/userfiles/file/12584802887.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/82562295885.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/1476289288.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/87768611859.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098add51dd20---22451647020.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160727b95c8c13---72323612408.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=russian+ball+piping+tips+australiaPDF 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_off0000c246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC246 10460 bytes
SHA-256: b4c92572412de2af433bd7b968c1caf1cbdce63c147abc46e5252abd8aa20a02
font_01_sfnt_off0000d9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F1 17408 bytes
SHA-256: 3be08d6920d906345f0f87987dc759882db22a7c8619211beb418c9d03b5b7af

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