Malicious PDF — malware analysis report

Static analysis result for SHA-256 129920f65ae5b5f9…

MALICIOUS

PDF

85.3 KB Created: 2021-09-03 07:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 56f7c7a54ed4fee3f5a8c1990f21613c SHA-1: b002640d92d4b6eae4f81380e5b03d5004b9b3ce SHA-256: 129920f65ae5b5f9de1a83bdfd8c219d6ff674d5cfa81bee77e952de9d73efeb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and numerous URLs pointing to compromised websites, indicating it's designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) and the nature of the links suggest this PDF was likely delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607118fdd896d---37669196438.pdf In PDF document text
    • http://maslag.eu/userfiles/file/48797498276.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e5896321921---suxenolatewudojopidekubox.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/zumavaxerefiden.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/keninapanagutojubolirixe.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/36628054434.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/zuxirovesunelirexarejidud.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/3kkncf79vghrhs1pvv33h4jnkr/penikofire.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f5e075783---garepusudoxuluw.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160984386db884---12429225382.pdfIn PDF document text
    • https://blogsma.com/files/zagolokizupesamuwipuziso.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/64466506786.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/tqgfluquah62pnqmnrtn0jd7qs/zelaku.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/92733406179.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/1414873008.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/55488093694.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160abbf183523f---widamejamuserawakogawipi.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c6738747856a2993d9d2d2caa0b1bad1/xakelilajasisimawazovi.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16073670486c20---92455659098.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3d5f81532---jurezazugitura.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/u2a0efinahhmpif1n2dqg5a099/lawasikuxazez.pdfIn PDF document text
    • http://veterani-pushkino.ru/userfiles/files/guxawibit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=the+reluctant+fundamentalist+full+book+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_off0000e639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE639 18052 bytes
SHA-256: 110a735fc98fe3cf731772de771591e70755d08260d7e0533769ee9099c49755
font_01_sfnt_off000115b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B5 11180 bytes
SHA-256: 7ea9beb1da584e7a79adf519fff46361ca2a88e3264d51a984244ae49da17056
font_02_sfnt_off00012f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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