Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd829da2d15184e…

MALICIOUS

PDF

94.3 KB Created: 2021-06-28 01:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8982995488742978fcd34a0251205d20 SHA-1: a6df2e769cbba39aa76a9215842ce35dd182479e SHA-256: 5bd829da2d15184eb09c7854eb92e5037fdd68cec7fff9cf745c5f08f0d5d66c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting. These links likely serve as lures for phishing or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/1a9afaf9ab9f59ecf0039c3e02eb0258/40768213720.pdf
    • http://architettoseneca.com/userfiles/files/31814562099.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8d622f261---89701535969.pdf
    • https://mecaniquekd.ca/upload/file/45040376809.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a596f37cd9b---55355443326.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb20a5415a---58217132464.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/d462ccd21a2c8349581a7666fa2c0c1c/jumexukakutiwezifoz.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4b763254d---mapexopurojetuj.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1606f919a6171e---63759707805.pdf
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/78072736043.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c239aabaa---pabigetopusoxeduzikanaza.pdf
    • http://elementsgogreen.com/userfiles/file/tudesuduluwobipufuxalisa.pdf
    • https://addsfly.com/userfiles/file/7356701920.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b22f16f2b7e---59389896201.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160d20c88f2dd4---35096586772.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607166a4efd0b---finameluzapudufiwilenegop.pdf
    • http://bluestandard.pl/ckfinder/userfiles/files/pezegenide.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608025d8adcf5---22721710664.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa83e81475d---8325688237.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/16211106798375.pdf
    • https://nadamasristorante.it/file/82272821909.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/b3d35402f60da9c315f58303fce03268/32474852665.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=shrimp+scampi+pasta+with+spinach
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f67b.bin
b4b042f22d9d12eab2709b3e1382cef9a03bb0c43990796d570e9287a6ccaa02
pdf-font-stream PDF embedded font (sfnt) at offset 0xF67B 10504 bytes
font_01_sfnt_off00010e37.bin
b4ab98e9fd1534117ff4ffeb2c9b5640f9189e68e85b210b96156d0b62b31437
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E37 17828 bytes
font_02_sfnt_off00013d44.bin
88a5f3ad9079b2340172ecd64f1cd79ba1ad1753eb2b73e58de10c5a7be67d15
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D44 16340 bytes
font_03_sfnt_off0001533b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1533B 16792 bytes