Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8655ca42463716…

MALICIOUS

PDF

88.4 KB Created: 2021-06-27 07:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c691be39ab37572001b8c98b49adcdc8 SHA-1: a080675c836db9c14fcf44e8bf93eaf9c8d3a71f SHA-256: 4d8655ca42463716aa5f623a88e511071e1754581c47088721bf6686d3ab5b44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the links and the detection suggests the PDF is intended to lead users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://fixafilm.se/userfiles/file/zenevapulupe.pdf
    • https://mszukam.pl/dat//file/jofirewilo.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcd2762d6f---sudewazemegoxekofetipagi.pdf
    • http://lamachine.nl/userfiles/file/kewusutujuwufadowopuxasi.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/bd10e185a86d52c358ccfb4bd9eae2d6/91987424565.pdf
    • http://jhdjt.com/images/upload/File/lawomilipukug.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/ss5qdpvfvvr1ia0t6in6u0f4pl/jegosodozafemusasajus.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086322e93448---57483663696.pdf
    • http://wchs67.com/clients/f/fd/fd50fd9748f3592dabdfdad26f378f15/File/pubixujuvejilufiboguvawu.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607beb46350c6---nilisudakijukinuridoja.pdf
    • http://jyjwqj.com/uploadfile/file///2021052619004838.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/b2b5ceb64543d03ede83a7f1817b6f0e/pijexoxamefubix.pdf
    • http://abacusnancy.com/userfiles/file/mumuboguluwakoxigadixat.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0f4726955---lajazuwumexenonuwim.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a95a987791---rovafofiwuweninubapogun.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/n8hsggas5vkd1pi2m2ihp99i34/tozinepib.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa8286fb05---71789383613.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/jc7uqf7nthlh6i8j7qeahgi5n5/xamaxem.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/a828562e89998d772ede768b7dd0e403/62734853322.pdf
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/woseseralebabamada.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/56d5af2ec087362a1179846c5b1e92b2/degetuxedo.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/nfkrju30su5l5d4ep7ie8hk0b2/21751651254.pdf
    • https://acavacecio.it/userfiles/files/xuravixegufujufuvete.pdf
    • http://papaicountrylodge-longstay.com/user_img/files/fafapojo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=best+astral+projection
    • 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_off0000f7b1.bin
39c2298ac0910f799eb6ccb42d6dce8151442022363d67188552268963d18f8e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B1 16992 bytes
font_01_sfnt_off00012417.bin
c9330c541794cf1c4b5693fd9ef18efa79ef694fe8613f87c32a3178248a196c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12417 10548 bytes
font_02_sfnt_off00013c3e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3E 16792 bytes