Malicious PDF — malware analysis report

Static analysis result for SHA-256 f403357c1f570005…

MALICIOUS

PDF

76.2 KB Created: 2021-09-01 00:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f4065a51f164a5b868fa9e9891c3a0c0 SHA-1: 7cbb6df7b34e1306cc15d96b6ff6c0d9ccde6d69 SHA-256: f403357c1f5700059e26a9dbe7f610271851d21a866ba9d80f639fe77bd65781
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware delivery attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=during+what+stage+of+photosynthesis+is+o2+produced PDF link annotation
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/zebijij.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078bf16458b8---gujagewexixem.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/mezuruw.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/sefojalamani.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/wulikorovevisosutigada.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/22b62c9d0ec9cdda610f0318d8201513/50332514295.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf82747fed6---65394375611.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/70716731858.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160783a15da165---92159668133.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/21994239e55a210cca957b50c7b16124/xolivozexixawanixapad.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/wijemafuvoravimaxu.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081787b067b3---86045427446.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/disuziwusole.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/f3462e52dcd1d771ba02120b7ad30cb5/loratirakopafuvix.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/34731190454.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/38954371656.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/43519854467.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/6478db95cc21d35cf52fd3523a0b86fe/domodigiruvewatigimokesi.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/70102288885.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba83b85645c---lobotepogakowi.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/peposusuzedopakopu.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/tevewijesuboriruwesejidaj.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f5584e85fce---xekotabonimozusova.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/19766fa4f34e788f58a322632d467ada/7458572978.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/0b060f66f346dbd207ef5fa5039dfc61/vupawurijukixifopatuveral.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_off0000c57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC57C 16380 bytes
SHA-256: 38fa16a254d7d9aebc7d765184bbf32c9d9f475ab1cc3775f70ef943b10ecba9
font_01_sfnt_off0000efbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBE 11272 bytes
SHA-256: e16c8a27d9823559e6d96642fe15a150d119e8149469e5cc5d63e3c069f4f2a9
font_02_sfnt_off00010a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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