Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cda0a8311ee398d…

MALICIOUS

PDF

71.4 KB Created: 2021-09-03 17:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8b51ea2a175201e00035408d5d03c194 SHA-1: f872760be57621d20baffb4abb9bdb207705d797 SHA-256: 3cda0a8311ee398d7d8c6ffce7a14a9e733cc310eb34c6daf4dad00283ae9d5f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple URLs pointing to potentially compromised CMS uploads and disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://au-zlato.sk/upload/files/20811165014.pdf In PDF document text
    • http://enidental.com/userfiles/file/20210817105433.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/68131525997.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/28119535306.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/tmp/32952101.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/kadad.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/49002654125.pdfIn PDF document text
    • http://maygiaphat.com/upload/files/bizibogamenaxesebimade.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/gufumedasaredadaj.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/33901147208.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce83371f2b---pixedumigalibovixabaneja.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/sabosezevo.pdfIn PDF document text
    • http://letdentalab.com/img/files/82812033866.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/subisizokidipojefimilowaz.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/39005889606.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d90ec66b6---58940728934.pdfIn PDF document text
    • http://uctodane.cz/UserFiles/File/64576200110.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/fititafosazuvupilego.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/d2db1496df652b52affdbc9b0990d15e/96551463539.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/pirafofizokalajuwinop.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/8ba7578c875703fbedf7b5f06fcec85d/sasowasososopuvuwaketozaj.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/fobubafafimatobuwunaroxe.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/66362699468.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/1ecaa67d27d4bd6aadf935bd53d146b8/wowamemabebaxo.pdfIn PDF document text
    • http://scsytech.com/upload/files/jaberitorid.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/e1cr1pbdr6efaai2muj8g23ki6/59613923266.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/ki6t8vodjomuud76qdthik28be/novutagepabetad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=grade+1+worksheets+free+printable+south+africaPDF 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_off0000b5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F9 15452 bytes
SHA-256: 00b429d02dc831d5ef35d03829751bc2c8fb1363c82c1f0b5604cc3cde05d9df
font_01_sfnt_off0000dd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF542 11228 bytes
SHA-256: 8b9547e19ea197e8924ef441b994577eecc295b110d4b349e43c04c0dc5fada5

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