Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aed440cfc4a5712…

MALICIOUS

PDF

182.4 KB Created: 2021-06-27 07:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cdd06883890d48bfca621109239744bd SHA-1: ed812c6c74b3114aef9e376efd8cda6aadc2dd60 SHA-256: 4aed440cfc4a571261ae20d69b479f3284629f95243c0d0c469410d507759079
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it is a link farm and specifically a lure for MFA or one-time code harvesting, consistent with credential phishing. The document body is heavily obfuscated and unreadable, but the presence of numerous links to potentially compromised WordPress sites suggests an attempt to redirect users to malicious login pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9740

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22eaa0c0e5---rigofuberogexowofuv.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857c0ec2d6b---90906053697.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/76ec3f446920c2b5551f518db73edd31/28738815130.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968b7956965---mufumol.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b48004e824---lixuloma.pdf
    • https://paklya.su/design/img/upload/file/zuxoniketi.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/ef530aac0eb7e769edf92921bf13a64a/venatujan.pdf
    • https://triptoboloyfoundation.org/editorsfiles/files/14519132028.pdf
    • http://progfin.pl/userfiles/file/gekuwulafawameduloxivu.pdf
    • http://blissworldbeauty.com/newerac2c/userfiles/file/21207451233.pdf
    • https://hse.tw/upload/file/96522037105.pdf
    • http://dzbnf.com/upload/file///78688333154.pdf
    • http://tantex.org/tantex/tantexuserfiles/file/93953081579.pdf
    • http://otoozevran.com/resimler/files/17272432154.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9d8db7372---lonojunutenoteb.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081214d7a80d---48054003225.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0e1ae3824---65396662944.pdf
    • http://cocoal.com/uploads/file/6386443479.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd33359f1f---vudanelupikagilo.pdf
    • http://rencontres-icare.org/userfiles/file/veponupidinebipolape.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/e02e7bd911f2b39ce841d03fbee0021c/18853760739.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/af40fd548281df6503e10c44fedbdab2/narawomotajisuruxoveb.pdf
    • http://sunjewelsonline.com/userfiles/file/15596138115.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160747e8b90009---77736690644.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c917cf39a---7822707127.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8ff244f2e---95206896197.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=pes+2021+android
    • 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_off00026d18.bin
b2b509bda9dba95a6981631ca2c75a3d9ab195dfce8010b3c4dab36e941981e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x26D18 18364 bytes
font_01_sfnt_off00029c6c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x29C6C 16792 bytes
font_02_sfnt_off0002b483.bin
29db6ecedca738533b355732428a07c58c88f415c9ff28b6bdbbcf90819b45c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x2B483 10392 bytes