Malicious PDF — malware analysis report

Static analysis result for SHA-256 88df068d4780676c…

MALICIOUS

PDF

84.1 KB Created: 2021-07-07 17:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af7a89364d4c5e68d5799e4fce150aa9 SHA-1: 55f8dfe5c926648fd80ebf5ba74184fa55503f16 SHA-256: 88df068d4780676c9321f2d2f22e8511f4da7df15967c1e0213c4e5d26bcc300
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which are hosted on compromised WordPress installations and appear to be part of a link farm. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of embedded URLs and the nature of the hosting suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79ef361a5---61409220617.pdf
    • http://terralindahigh1981.com/clients/866868/File/tesobokesudigisezaluja.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d1ecae0e5---56823018873.pdf
    • http://tipiland.net/upload/file/72613756461.pdf
    • http://assessmentinsight.com/ckfinder/userfiles/files/fidemim.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a107a0e527b---52164052794.pdf
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c75f1885df---wajuxijizajusake.pdf
    • https://baxsporthorses.nl/userfiles/file/80617198678.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/lndr2lgqq1nadjqdeidn31fldk/pusepuna.pdf
    • http://ondrejkocar.cz/img/file/57993201766.pdf
    • http://artospace.com/pics/file/62606907077.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/29025c226b2062dea8f007e1986b708c/jifevewuvuku.pdf
    • http://www.anjhimayath.com/upload/file/2723184691.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc22054e92---radowewugimawoxigik.pdf
    • https://ikima.fr/uploads/file/62454510324.pdf
    • http://jfhcoaching.nl/userfiles/files/93858435684.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb2b33420c---68077467455.pdf
    • https://pasarantogel2.com/contents//files/87616143940.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/b5960b044caaee08ffb67a5c2e53539d/fipuvim.pdf
    • https://atcotourismtravel.com/userfiles/file/32308731934.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d67464124---kixasid.pdf
    • http://pnmanagementsolutions.in/uploads/52896543958.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/gpnucj46cc14dnos8ujveal1h5/25356482346.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=what+to+do+for+a+pulled+muscle+in+your+back
    • 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_off0000e720.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE720 16792 bytes
font_01_sfnt_off0000ff37.bin
f42445b4c30318493f0af1adbe441f3219648ae9c1bc2b14f8b1d1765e56f9d9
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF37 11324 bytes
font_02_sfnt_off0001197e.bin
e1b395e584277791d41d695d2d83207a8e5fddfb9f52f080cd161a4786afa11a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1197E 16008 bytes