Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d0a58ce199eb24…

MALICIOUS

PDF

88.8 KB Created: 2021-06-28 15:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c56d1c7421ca29f9e33ef38d39ac747d SHA-1: 2f8d2491aea9ef45ab9b9d1d0806edf144b47ff7 SHA-256: 91d0a58ce199eb24507e74ae31e61207a149bfd73622dc9c05294ddcda344a8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure, likely designed to trick users into downloading further malicious content or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/5cbfe037bcc202dab085b14d293d7477/40037717174.pdf In PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5afd30310---30542767574.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084db1688178---36573849592.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/f62fc6fef3806306650c656498b7f96b/29627274982.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/redetobezoropunemomeziv.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/2031a038c23603c56cc3da3335a45bb4/dawumewi.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/nogidezolibumabodeb.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/59en7tbvd2uf1cp5i3f0f0d4kf/mamikafedolil.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac97d1fa0b---52520058995.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/wulebuvavilamusi.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076fe1fa55e8---golugikixubinet.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/94253776752.pdfIn PDF document text
    • https://termoformat.md/img/files/5775706017.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/256907168a0336f0457f5732cd6fc361/3591115712.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01f9e633c1---vefumor.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ntlobi0tv1mcjnauho4ve9h1e5/lakelarob.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/tofojedenu.pdfIn PDF document text
    • https://topaldanang.com/uploads/image/files/61002583670.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/a766r2o78el00rs130k5l25t92/wirisuf.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/402076ddbc509deccd1e19ea7ae62444/sidujewasen.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c35e5be0f40---lefukobovirobibu.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/xipodi.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/6940798de19e8999039dbd377fe5835d/taxapixukej.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf680d5b97---rimebibuwefugotimodinax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=english+phrasal+verbs+in+use+advanced+2nd+edition+pdfPDF link annotation
    • 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF3 29744 bytes
SHA-256: 81230be1bad48cec3fbcef720224032dbd84b4b2b1bad5109d891c670ebb355a
font_01_sfnt_off00010b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B73 11308 bytes
SHA-256: 71b962251d1f47e6ed3dabe907df8146fa1fa0e2937788ed40b76b9ac3aedbe0
font_02_sfnt_off00012596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12596 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA7 16080 bytes
SHA-256: b1c6688c4117b2eb132fe321d6e5c0cba7066824bbd4880a4905979a2499efec

Open this report in the interactive analyzer, or submit your own file for analysis.