Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da11c463bf89679…

MALICIOUS

PDF

88.3 KB Created: 2021-09-17 02:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5869a37e1a63dba10842cad342067f12 SHA-1: c51ae2a174435221b89002dec2330b485cbe9c3c SHA-256: 3da11c463bf89679425276b84d1fcd6a69756c805730aa63164696707c047b61
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 a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate an attempt to lure victims to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rowodizawubekemezimuvol.pdf In PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/suzakesij.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/mufuwoxurewod.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/tijiruruxobonunogunovat.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/xevevugukerivukapof.pdfIn PDF document text
    • http://kotolantopeni.cz/file/putopejutopot.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zarov.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/snh4im8h2ruaf5ota30bibninb/zolelilitetijiril.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/33769030258.pdfIn PDF document text
    • http://sdsenlex.com/upload/files/72465030499.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/b5984460fb2ab1abd2281e722ede4da6/lutinapa.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/mogedixanomufe.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/90197544780.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/31057628879.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/difesadoxuwinowapet.pdfIn PDF document text
    • http://happy-land.hu/editor_up/kenajixubilujovafupo.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0626aa668---demefotok.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/kixezipa.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/736189853.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3a0c1f3fd---19537506138.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/61846355593.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/tuvarafas.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/zateberawij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=can+you+play+pes+mobile+offlinePDF 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_off0000f599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF599 10708 bytes
SHA-256: 1e1c7b823adac55fc80047bb725e74d687867eb2010fcddfd314f1c8e1af4cea
font_01_sfnt_off00010df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF2 17472 bytes
SHA-256: 15ac8fb3663f566e04309511879a7b5d922dc9a08f89a98130f2e445d0da6160
font_02_sfnt_off00013b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1