Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3527711ba197be8…

MALICIOUS

PDF

81.9 KB Created: 2021-09-13 01:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: da9687735a763c684c53ff309408bfae SHA-1: 30bb4dc94ed21c5f32e085f0cbbd592310ed30a0 SHA-256: c3527711ba197be8cd2fd124bed78b88842bc9e6d0e99a8d48a18d27ec0e8b33
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The sample was identified as malicious by ML classifiers and ClamAV, with a critical heuristic flagging it as a credential phishing lure. The document's content, though heavily obfuscated in the provided excerpt, is consistent with MFA or one-time code harvesting schemes. The presence of numerous external links, some pointing to compromised CMS uploads and disposable hosting, further supports a phishing or link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://be-now.pl/userfiles/file/sekigi.pdf In PDF document text
    • http://intproplaw.com/admin/uploads/file/kogejazezanefixorubame.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/31832905631.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/vuzegebonit.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/nidowawakubexawomed.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/pixitolemadod.pdfIn PDF document text
    • http://planetamama.ru/files/file/jajaxutite.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/jijaxoji.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/xisizisevaxarud.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/ba467d90b5db727c1d4f32455ba00e6a/wazegibax.pdfIn PDF document text
    • http://descanso.verareyes.com/ckfinder/userfiles/files/gajuvusuvim.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/22662344692.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d78a5d284---67828796253.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/sakimuvopoxupetaf.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9846384b1---58179207600.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7b05bef14---13344983614.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/23891315295.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/16280086087.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/ditiladesiwajexaz.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/53566230723.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/zupotowetumibawupozuburox.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132937436b05---2605460980.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/3364809644.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=configuring+hotmail+on+androidPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/rizaja.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3D 17588 bytes
SHA-256: 708223e30f4e6636ee6ccf6574dfc5052a2e6b45d82aa2c6c99dcf2729f45daf
font_01_sfnt_off0001096d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12184 10632 bytes
SHA-256: ed87793034d697e551e109185c37b6685ba57f20817ea8f0f3ab0137950c4d02

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