Malicious PDF — malware analysis report

Static analysis result for SHA-256 77256d222df67c4f…

MALICIOUS

PDF

86.4 KB Created: 2021-06-29 09:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 48367d08fb886da85d6c7e34f6047dcf SHA-1: 967c107e99cce4b63adf95dc9843e6349f25acb9 SHA-256: 77256d222df67c4fb1fec569cf61cc712e96893389f1da5762f9e0b040170378
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. The presence of numerous external links, many hosted on potentially disposable domains or compromised CMS uploads, strongly suggests an effort to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609466af741c3---73179941332.pdf In PDF document text
    • http://jucal.es/images/file/89943437202.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/vabupibeki.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/b8b6f27a3aa22c50ec05b6a57b910687/67236873301.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/14975718341.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/99710858308.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/raxur.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/r4f3rkv1l845l4bhjni454r8h0/74127104042.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/f928be422369c677700bd66dca47fbeb/dobifopejadeletax.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/beniwokifizirovokuwerapep.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/gijezitudidogilemumidux.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd650c9a59---38961765388.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/cc5689bc3bb39187abb7916188ae8351/ratigifufafutav.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/53a62682cb2046a3c8432c7f8ef3c4c8/53500868777.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/47363401689.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/vopavido.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609830d0bfd3b---bofezosowolusipo.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9450e3fac---duraranewaletufupi.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5425428b97---rosemexidi.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715a8febd8c---81836085666.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/32a69d38f9bf3aae7c7123a1cac25c64/16665028675.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/etbjk8s10pstvfuc7v5rm6d1jr/18844176561.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/kenolawijofajukisefejud.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/lobedusirametoz.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/efms17jvs2vfuig20nq2n1lbj1/gisitevefebowetanomikador.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7377d8251---bepon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+repot+liliesPDF 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_off0000f0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A4 16832 bytes
SHA-256: 5e8f8257a26fff189f80f9c18f9d4e5bc52a992cfeb1abd7afa025ffe6063107
font_01_sfnt_off00011c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001349e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349E 10056 bytes
SHA-256: bad2e2c48439b18b001249bdeb16ef2a4246c3494a163ce42a0becd276eae1c1