Malicious PDF — malware analysis report

Static analysis result for SHA-256 51540192742f611c…

MALICIOUS

PDF

86.4 KB Created: 2021-07-14 05:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 561cb97a69f024904a4c2690279ff7f3 SHA-1: 5316c6257dc4fb4783b09968db95619c3500405c SHA-256: 51540192742f611cc4027de09c0bb7deb84905cdaa247dc7b19c5f3895b8dc04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://chcial.ru/uplcv?utm_term=colour+of+week+days PDF link annotation
    • http://upoart.com/ckfinder/userfiles/files/golidosag.pdfIn PDF document text
    • http://cjatkinson.com/userimages/69363960344.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/xovatatiranogirudu.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608345ff3a7e5---jewaludulajitotosafon.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16080040f8fdc9---19986998826.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/70999828843.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/567819301.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/zewopifigizagavepite.pdfIn PDF document text
    • http://parquessolaresdenavarra.com/userfiles/files/pamiwesoniwimugowupoxobaw.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/dumm6thhbkdu5qkloiokto3s41/luniwedikefinodovexekar.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/3gp9ovju4e5bm7aeb2m5fpd04c/ruzojowaxewipakijun.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/difexezifat.pdfIn PDF document text
    • http://gapp.fr/medias/files/tevamanap.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/c67ab8a645861053dd73305a086f10c2/50501349169.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/50449536471.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea70daa1bc---buzuwagimatofaxokezawagex.pdfIn PDF document text
    • http://lulanjina.net/upload/files/wavizazuje.pdfIn PDF document text
    • http://allasclub.com/campannas/file/feloxiz.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/61aa96ed0a826feb67f3faa86703dc1b/rekonirosivopu.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091824b369d5---voviju.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/bavativax.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/4c06f0735fa4cb5d5f64f4c433410e68/gewewekubowivebideked.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c431a27cabcf5acc8ea650e75b03cb22/telegipujixozenekuta.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3F 10476 bytes
SHA-256: 0d4179b33b8f84edd53f72192d63da55ecbc7399a3e97f7c2c74db6124dba772
font_01_sfnt_off00010553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10553 17500 bytes
SHA-256: ea7e4034d5d090e2bfaef3afc98c0a406f58d09a4cd5922685d6f800a0ecafb6
font_02_sfnt_off00013300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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