Malicious PDF — malware analysis report

Static analysis result for SHA-256 79bb357a705963d6…

MALICIOUS

PDF

74.4 KB Created: 2021-07-23 10:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 38902204db08146f98af108120375af5 SHA-1: b66fb5af368f433c81f6434642b2caa3bd8b5f12 SHA-256: 79bb357a705963d66e04010eada19ea4ae98a5419fc1b8d343559b0c4e70b249
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious or phishing sites. The presence of embedded URLs and the nature of the heuristics indicate an attempt to lure users to external resources, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/18e1pr1hod7drniq7ohbrfg1v3/219278319.pdf In PDF document text
    • https://lesura.net/userfiles/file/57459902317.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/6a2c5f25648f033de5b8e0a4a5d8a3ec/pamowuvolo.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/xexenalawen.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094373027795---gunaxamuxobijof.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/kobovajafanalofosiz.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021071521324080554.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d4c6b73b3---nulisuravagakokoxuwudan.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d897d5e7---ziridapoxuli.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/pawesofuniwok.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c066eac98d1---xonumewisupogose.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/giwux.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/fuzarig.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/a608049ffe3adb6c3281bb2356a8e6f8/mikogif.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9722b6fdf6---mekejinufo.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/qc4val7uh11vf32l1ht88p1851/4948224167.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/95dea4294ba61d14ff9e743073a02714/raduzatomib.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/74522087361.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/73400260730.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/19038082810.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856ae4da6d9---62996915303.pdfIn PDF document text
    • https://area5srl.it/file/duramufe.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/63d8e3fb53fb1c8ad7dd0b19fd579b80/xasexegokuwogixif.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dd49bb2a8---zevewajukofiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=check+my+lotto+numbersPDF 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_off0000c10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC10E 16160 bytes
SHA-256: acff70bdbca7e2a660a960043998a16db7660b8487fe5b7980eea0e8ed6c7138
font_01_sfnt_off0000ea4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4F 10716 bytes
SHA-256: 0602e59e9757f2be6fea5fa4a6e21e54a4665d31adb43510a1f3b840191e6b55
font_02_sfnt_off000102cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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