Malicious PDF — malware analysis report

Static analysis result for SHA-256 57abe87000d53b53…

MALICIOUS

PDF

90.2 KB Created: 2021-07-21 04:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 687d60e8570c14e29747fdf6eee65718 SHA-1: 7e3c03c776e56a84e6b7075293169af965999fb0 SHA-256: 57abe87000d53b537ce085c50f31683c0fdeddc1e4f5bdea56359f388b12111f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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 https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/6494fsoaovb8us6qi9ekr23kon/nuwalarufarugifuba.pdf
    • https://eyetracking.pl/userfiles/file/71470593465.pdf
    • http://jrmhandling.nl/upload/file/26080832938.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//tibuwuwolomujatemivu.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba01af28ce3---77522492404.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16094adea55910---napufenakalenavogekob.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a641bf8d580---30071340165.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fce32d8126---35851185392.pdf
    • https://cakenflowersonline.com/userfiles/file/dixigejoso.pdf
    • http://lakesideterracecondo.com/clients/41361/File/64281673882.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86af2d3ce---sutulaf.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/067d05d46255d4504cf6540df68389e1/goxamigol.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/2ef58dbe68d0424510b5015d21449591/14791209438.pdf
    • http://citywideok.com/clients/75789/File/47808593326.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/f23bf388dacef7bd690ad5477a3eac7d/2304877299.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/cc21ee084efcd892acdc0659bbfa51a8/ginarot.pdf
    • http://fine-trading-knotwork.de/uploads/media/zusovamupefaziwimubera.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160945002ea56f---womebofijegesigelozi.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b62480f575---9418739238.pdf
    • http://tw-sincere.com/upfiles/editor/files/86630976276.pdf
    • http://locnuocvietmy.com/Images_upload/files/sutizefasusimovoxuledoja.pdf
    • http://imaginove.eu/data/Files/21086654310.pdf
    • http://galettedesrois.hu/userfiles/file/76234402600.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/49b73d69cee000aa886d3184a3bb82af/tutiserobokojulojelinusu.pdf
    • https://marathonlaval.com/userfiles/files/5336366893.pdf
    • http://ajtoablakcentrum.com/_user/file/84104508666.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=anonymous+sms+bomber
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3f1.bin
7b26d2fdb460789000753292a3e318f0c9bd3ab7c075be6d3d9f02bdc3834d5a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F1 18084 bytes
font_01_sfnt_off00012416.bin
3b2665576e0e733557d54fd8b7ab9fbf951407a02dcda8f4f3f3dabcf3176750
pdf-font-stream PDF embedded font (sfnt) at offset 0x12416 1708 bytes
font_02_sfnt_off00012c33.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C33 16792 bytes
font_03_sfnt_off0001444a.bin
812768525b1a659d10ce8368bf5ae4bbbe56d173a0f8dbb7b827eea6850f76cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x1444A 10208 bytes