Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f7b6fbbc65c6b4e…

MALICIOUS

PDF

85.8 KB Created: 2021-07-02 00:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 91e6e194b7bf0e38ad4a4661868c0bab SHA-1: 5cc3afedbf7a5644e69affc2285bd34d5ff94d6c SHA-256: 0f7b6fbbc65c6b4e4f3c5ccc384163b71e981cdf2be63b4433897ff70be7b74c
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress sites. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b0822e4c4---88004113558.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160881ce8bcb19---zabadozep.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071c7fdc9648---99970159305.pdf
    • http://uptownchantilly.com/uploads/files/tagitikijomisipa.pdf
    • http://sgpeo.pl/users//file/42531421449.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1d63ce244---72338955545.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160aa68bd1b72b---11218147405.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb696b3033---25919489883.pdf
    • https://thinkhigh-tech.com/d/files/balijuroje.pdf
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/5ea32c7bc8646dd8ca603216312b3efe/23814523902.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/7208d9f37598ccff49e428c8caead012/83512175472.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/9dd48f017daadfa8f100c388d0779152/xokafazomimim.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/99c40c112118887393c4421e8d9aeae0/95728198108.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0668028959---7143761377.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/ljjqjj5mtinij4bj1q83b6ldpi/fasilifeto.pdf
    • https://beautyyaurient.com/editor_upload/file/8594780726.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/a5d9a5b7e41a9bdb0174bd2c6335f424/70407564295.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/kknkjrhogntbiek6j73jkcc6la/46363849221.pdf
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210615_58A576648504CB8F.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/5a1f2167fe47ec16fb5f577a2ba19e3b/41908625902.pdf
    • http://ahchala.com/img/file/vefitomudi.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d61430cc765---xanud.pdf
    • http://archerelectricsupply.com/userfiles/file/jafire.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/723312a94028885f5f3a8da6cd2af9ce/voxuxexo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=tightness+in+middle+of+stomach
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb91.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB91 16792 bytes
font_01_sfnt_off000103a3.bin
4e4f74e8b31e310d3dae825d5a7d3ad473bd9f36650e62dbc5f7370736485586
pdf-font-stream PDF embedded font (sfnt) at offset 0x103A3 17692 bytes
font_02_sfnt_off0001319d.bin
4492eaeb420ea34288c3202d11c9e73d4ed9c87b8f5e13fd292ffba7c0f7f1cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x1319D 10784 bytes