Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a2e908db7afb834…

MALICIOUS

PDF

91.6 KB Created: 2021-07-24 17:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c01f76a75841f22c22312f1bd16a74c5 SHA-1: c788d19b0caa137b7d78dcad935620efb611b445 SHA-256: 5a2e908db7afb8344e1e8b74b4b7c797752993a4e1520766b034d726e9fd7f42
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/ebf318e3a681086830eb7f803240637b/wobazejizilojajitojezosiv.pdf
    • https://alnahamgroup.com/userfiles/file/diralokedanesotewozaxupo.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1e2a56722---96516719364.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/ec07878b01dbf8d2945a2edfb23527d0/40936949960.pdf
    • http://radio-salsa.com/php/rs/filesupload/file/87939799114.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ed925e574---76208464703.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/65e37de36fd38f7a3ecd204d5f2066d3/mabofi.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160cade20b6891---bozajojujubojasabe.pdf
    • https://virtualpulse.eu/UserFiles/file/43806277588.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094d068b1900---19391701763.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608323812f5fb---9644519681.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea0fe3165d---gixigowif.pdf
    • http://giacongcomposite.com/upload/ck/files/nosobavimaz.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-2/20210502151146874375.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb17f58cfe2---suwiliw.pdf
    • https://africanresearchcenter.com/userfiles/file/22734240438.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765373f3300---84202133125.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091fa9e36769---2963560389.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c21597183---49784549377.pdf
    • http://mikomisushi.com/uploads/files/putuxakukovazadojinigox.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/e1b5caeb905338dd4d75bba207ca5812/22947366216.pdf
    • http://dancedynamicsla.com/clients/38740/File/26893627700.pdf
    • http://grapevinewinerytrail.com/clients/876125/File/9566963935.pdf
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/782b64e5fb08cae17d33b1a12304a728/vakemeg.pdf
    • http://tareeapartment.com/user_img/files/kujuvejomuruwopip.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=what+is+the+best+teas+study+guide
    • http://s292376414.onlinehome.fr/datas/imgmail/file/94669314598.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_off00010377.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10377 16792 bytes
font_01_sfnt_off00011b8e.bin
ded9b4f964d5479a2574d4be2519a3306d961f109e724f6999e886c87d8680f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8E 10504 bytes
font_02_sfnt_off00013366.bin
7b369bc7a31a358c50619b1157ff4d4b40af1cda423bae51d68157f2ef592162
pdf-font-stream PDF embedded font (sfnt) at offset 0x13366 17508 bytes