Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf4fe58a5ae86b5…

MALICIOUS

PDF

84.5 KB Created: 2021-07-02 16:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: db65261d65dd09bb0f3fbfa4fa12140d SHA-1: 3fd12139fb219c61d9780de1c2307a921b7f5bea SHA-256: 9bf4fe58a5ae86b5d8c29597335a4d8dc0bc10c38a1e1957beec82f5358b68c0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ifm3m18fsibqa956io4vr6te03/gedokeximon.pdf In PDF document text
    • https://aspit.ro/imagini_ws/8012148684.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/59286966022.pdfIn PDF document text
    • https://emmaushuis.org/pages/49510169098.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160740b9691b7e---xamazasupidomigekomubavu.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/q05mj346akfq2fjegjq5a8l93q/mibidalaremokubezapibo.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/86312897325.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/62804519211.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/1a94bddf8b812078ad128b74e162b47c/livujasepoberi.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/89507798292.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/zovopisubupokakuvajinuno.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/4b8c741c0e2e6b4a6ecdc4c53959c76b/52443370510.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/umi9k20f20a28tvc7fjhv2vs72/ritezapikup.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/1337472363.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160adb04adc1a3---monetuvopij.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/b895205738f0b80ee71f6cf12c20208d/vusiwirob.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927cea3d73d---galifejinabofokukiropus.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/liromifefexuju.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/62976038849.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/otqesglu88k8m9osuc4tor2ffd/3904521240.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de93e1eafff---woziwinewikeze.pdfIn PDF document text
    • http://twilaw.com/files/files/zukifugatirowisisega.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/kl4fi51s2m6hvbmgcgh5kqvt9u/muxopoluwori.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0806a222e9---86683931115.pdfIn PDF document text
    • http://anjilh.com/uploadfile/file///2021051509533194.pdfIn PDF document text
    • http://sartor.ru/upload/files/75131189463.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/264daff9f9912ccef850adee8b6e7ffb/vemokazujalujiwasizato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=worm+under+a+microscopePDF 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_off0000e994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE994 10624 bytes
SHA-256: d4784b4b2f99326233922ce7765b79d719420d90201e2e39564673ad28abf60b
font_01_sfnt_off000101d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D4 16588 bytes
SHA-256: 88467e234c01a7556ab7dba0c6a5722dd373c8f654adf74d0750a0c10605ee88
font_02_sfnt_off00012cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1