Malicious PDF — malware analysis report

Static analysis result for SHA-256 92ab28fa0ccdb4fd…

MALICIOUS

PDF

83.2 KB Created: 2021-09-10 02:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6e2570267d6d7955cc21ac81292b4a43 SHA-1: 36a6fa9f64c23526667cfdd99342eaa323162ab8 SHA-256: 92ab28fa0ccdb4fd5009c21c00537a5976ed77a4649548347629f33976c1d26d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload storage locations, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://autoprofi.ua/userfiles/file/37195839573.pdf In PDF document text
    • http://osmed.cz/app/webroot/files/files/4831464537.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/nixaretazexomuwifo.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131723c74f3f---5108556280.pdfIn PDF document text
    • http://fohow77.ru/upload/file/bibulofolirozotukigot.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/pumazakupuneviwadejuxu.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/tujirusebex.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/563e44aab2f4b6d858d97ca04bb25f29/pepatajusedikevopaxubobu.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/sometimejitidevagipofojaj.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/27096643275.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16138886b969e0---3982861085.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e19c81207---61522318692.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/zubenu.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346b603b86c---dapefonazodokudax.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/kaxoxomojivunujodenane.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/33607525701.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/luleribuwejilutitibabeki.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/82763565255.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-3/20210903152138725163.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/bosm9r24dao8k09106psauiern/60189914018.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/sotirowas.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/ludipisatifubokowelunosoz.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210902_065411.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/lojowekusejoxatudub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=skyline+emulator+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB5 18504 bytes
SHA-256: c6e63ee5d91324396688736b1ee273c94f3387d2eb60f0208808ca1e5911fe2c
font_01_sfnt_off00010ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED9 10708 bytes
SHA-256: 6448723b54346b43f6a0dc39fbe49766eb6a1ad0059830f4f05bc5c2feecabb3
font_02_sfnt_off00012777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12777 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1