Malicious PDF — malware analysis report

Static analysis result for SHA-256 021c76061236ef27…

MALICIOUS

PDF

114.2 KB Created: 2021-06-24 11:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: cc8bf53c004068feac1412ef18bbfb4a SHA-1: 69a819f0fe00b144bfda75fdc894a2b7ba06e698 SHA-256: 021c76061236ef27edb867f2831f79677b0285d9050cea396ae0535c9368bdb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous embedded URLs point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to "Tiger blood in the mouth trailer" and wkhtmltopdf, likely a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://chcial.ru/uplcv?utm_term=tiger+blood+in+the+mouth+trailer PDF link annotation
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aa04a46f332---50664733626.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/30f297628dde21df2526ced441312227/duwozatejutaba.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/latorelixelizovunekere.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/hj3ab6huv1sppkbd9cjnbggf82/84785390312.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/fobawewewubore.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/72b36a5650fdcad6e9d4ccf20aff2f8b/soloretejuzo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160786dc3f23b4---nudizaxerunewediduvel.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24b60e12c3---fakokozake.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/50956735334.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/289198053.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e25c9bda0---sasafe.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/4vnir2e1efi2lbh4qe0maaboot/nukamexiwu.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/f20ee5e59bb6b324e047e15cdf7b2b2e/domufebi.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c5ad57ff096fdff9a9be22e77f27af98/33569740703.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/8b734b9855fac8438defcd31f6b24838/46356980138.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a445d99ae71---jovezugudu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00019270.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x19270 22604 bytes
SHA-256: 35a9a6129b24aebc55f1ded9bd3b3ba23705d8695274fda88410c37daf52d989
font_00_sfnt_off00013661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13661 5908 bytes
SHA-256: c99b43bc47da083fec77c317c4737e17a60f09e933b116932edfc01f03f7cc81
font_01_sfnt_off00014abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ABF 5152 bytes
SHA-256: fe0ec2bc0aa52e84249ba9668c91e297d92e11ca9ecf633468ae6e51fe6bab8c
font_02_sfnt_off00015c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C11 18028 bytes
SHA-256: 4268d0e9195d6713dd394aef3b7186ba11151e1f30b1e81ac32d1433d8485213

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