Malicious PDF — malware analysis report

Static analysis result for SHA-256 eefd10887e6b9b15…

MALICIOUS

PDF

73.2 KB Created: 2021-06-26 12:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 37f677a3b325d4d4c5e14cbedff141bc SHA-1: 243d9895adba5708380e98e08ebfb1c748fa7a9b SHA-256: eefd10887e6b9b15d0f62cc303f3b24289b24976c0ac903662e3120029a97e1e
156 Risk Score

Malware Insights

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

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely lead to phishing pages or further malware downloads, constituting a malicious spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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 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://medvor.ru/uplcv?utm_term=equestria+girls+tales+of+canterlot
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af9077a0d8---duraloratif.pdf
    • https://aulacvn.com/upload/fck/file/donusatifowo.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/cc3524627610a247333f0e3908208fca/kidodovufiroxukutigafel.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bbbf6a20f---wexemalej.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdad7e6c74---dexadoxapabijagosobaz.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4783e935ed---pujagajam.pdf
    • https://mbzl-pro.xyz/web/img/podborky/files/76811888194.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/ebb3e4b207c449dba9dc362da2bc4589/ruzinezelunadojixosixudaw.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec83eb814c---72436179204.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/nlcjbvc4hjlj8s16l1o6infmmf/24836631222.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/dd07f51a7f7f415f49021a744ac49a98/suwejevujogurokizuwid.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba933e16ea1---99738229917.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5b8d28e9a---jokofu.pdf
    • http://tiramisu-o.com/yamituki-n/uploads/files/21484045115.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e82f0ccd94---guvimisujesunefaj.pdf
    • http://cleanyachts.it/writable/public/userfiles/file/dibawepom.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ad9e0f0bf---30570129674.pdf
    • http://businessvaluationapp.com//fck_files/file/71005518370.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/44da08ec2153b9a6894fd77987ccea66/34501677054.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dba6075eec---48329210216.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/17120081014.pdf
    • 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_off0000ba2d.bin
d4162ca501862cf31114df7e834c1802909c45a6462e577e1cfc583a1383823d
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA2D 17036 bytes
font_01_sfnt_off0000e566.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE566 16792 bytes
font_02_sfnt_off0000fd7d.bin
0a6282f56d27fd1e188b5f320d1633ca6f6429fdb13f9f45068a2eb63183b8eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7D 10740 bytes