Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5cec8455bc3dcde…

MALICIOUS

PDF

88.7 KB Created: 2021-08-02 03:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d05895ced37bfb477d4aa264f79b18c SHA-1: 29cb773c8cbf2b012356ff5fb7914b572f78ff4e SHA-256: d5cec8455bc3dcde4e378f127c23eaf9614b057ed7b8b6997285b5332b7dae63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://cplastik.com/data/cms/file/rowomezawofelumebeja.pdf
    • http://sunwisechem.com/Uploadfiles/files/zivipon.pdf
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/ritokivonogusafawuzuz.pdf
    • http://banquat.com/userfiles/files/22211182142.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608776eb34409---kojowobedubakegedikekobu.pdf
    • https://childconcern.in/trila/userfiles/file/fowiretemazex.pdf
    • http://banghaija.com/userfiles/file/jigumatuzejusedisinijipoj.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/16760700716797495ba2951b6ab2c557/takawixixivexevowodel.pdf
    • http://em-mould.com/ckfinder/userfiles/files/pivevefebolidibajab.pdf
    • https://italvaping.com/file/burizijevakudovojov.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/0v92jja5q3341a7vgc92j8tc23/judesi.pdf
    • https://dichvuketoanvn.org/uploads/files/51788422228.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160abdda1824c9---65076101907.pdf
    • http://anatolianlgs.com/userfiles/file/54166889949.pdf
    • http://portalkucharski.pl/app/webroot/media/files/mumunilowogixo.pdf
    • http://phantasos.org/userfiles/file/76161923279.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbb6e946be---busipopovikobameg.pdf
    • http://richardsonfamilyreunion.net/clients/7/79/79e100fddb184f5a3447a495e7c481fb/File/zubexo.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086b21455746---remorisi.pdf
    • https://hizlipin.com/calisma2/files/uploads/78939108400.pdf
    • https://papersacksfactory.ae/images/bulk_images/files/nugukojazidodexiz.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608838f98fb23---xesenevisume.pdf
    • https://gifarlcm.com/upfiles/editor/files/8531915984.pdf
    • https://sitycare.com/FCK-UserFiles/files/bizubupomuv.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=mamma+mia+orchestra+score+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_off0000f768.bin
2d1c73d1a29b79ec19d6b33cd77ee57630d927ecb2c11fb856e9b0d44ed538d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF768 10728 bytes
font_01_sfnt_off0001100d.bin
1ac2106aa8439243931105dcbbc2c6676c6ccaaee74d2e8c089494c8aaf605ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x1100D 17124 bytes
font_02_sfnt_off00013c3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3A 16792 bytes