Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c1283b01b8a3779…

MALICIOUS

PDF

80.9 KB Created: 2021-09-03 01:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e70b497159eecd9914c2652a6cf5a3b0 SHA-1: 278e3a908150330d5b7302a885afdb75689af5d4 SHA-256: 7c1283b01b8a3779029c1ba722ced3d4ad9b419e2660d3894af097adc245c93b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and detection signatures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://nocnepal.org.np/ckfinder/userfiles/files/wimexodoroba.pdf In PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e672945c564---fijilijasukemaremu.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/8738559396.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/a2b50dbcfd141390f7c45edebace0ae5/47358667784.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/86653fd993480ba82e6850f2027d120d/73992932775.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/tavexugedebowigitide.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962b2c91f23---fojavizokobifiloxu.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/pobiluzotemanuzezom.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/voket.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/toxuwobisapanusaviri.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021080816430773499.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/33172584140.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/19969899032.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8df42785f7---82527537521.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/bisoduzubit.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/gefabowuvidenofux.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/28289415917.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c1480ba585a---3097097871.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cadc12c82e---xopifevujefiziga.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/mijetimetedebalu.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f50c08a07---56793813774.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=kindergarten+number+worksheets+1-10+pdfPDF 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_off0000d658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD658 11516 bytes
SHA-256: 1c89f57243ecc31f286d369450e400e5fdfad31b01271f3f562cbb7ff2443c2b
font_01_sfnt_off0000f11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11D 17576 bytes
SHA-256: 2c67e56219c31f337f5afb26770167ea745944474c9c402a747360c7f1b10681
font_02_sfnt_off00011e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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