Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab818e64917ba63…

MALICIOUS

PDF

86.8 KB Created: 2021-06-28 20:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: e19a0c8c1219f7e383bc1e728b570e1c SHA-1: aea6d67583afd3838749443125c628b62d3a57c4 SHA-256: 3ab818e64917ba63c0d681f4288ade5c8b8ac9b342bee5e85d1bbce540503f5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://krisoc.ru/uplcv?utm_term=too+lazy+to+live PDF link annotation
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/56b5ab4c711f2293a44f35d29fb9ab07/zukitaridakelorisotokotew.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/d05b54f3c92da00487d34e30771a7265/wujifurixigikulijanawik.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e793b99d5d---72596915396.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73f04465fa---womisavu.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/95b38822957d450b51a693f8d971045b/97661216255.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/9929f75588adda51d7ab67382cb25b1a/mexivelimebabonutirasil.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/nariwakiso.pdfIn PDF document text
    • https://luminex.pl/upload/file/domajoganexepebiwupa.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/0be5c3f62b8f88dec497f1989fd0e35d/35891144838.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a89f8a68e4a---16772698248.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/79d252a501f620da691e8059d58b212f/83632799446.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d35afcf09a9---vibamawok.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c41025846d---birakudu.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/24g4146v47hedg3j36bv4njqqp/35219432605.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081c628a1ff3---pinomopozuwejaxo.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/bumarumamumim.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095996b6a26f---17132614232.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/1ff12eb896ceb339357bfa7fca7552f9/fuzumudo.pdfIn PDF document text
    • https://12tiga.com/contents//files/totusobe.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/qjsid3cnfabvkclv8a15k4c1se/9329753043.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/musanopi.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/5213729739.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_off0000f240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF240 17028 bytes
SHA-256: fa1ca210f4adf19959570d20d92f07fe731737a93caa23870f3863cf596bc0c8
font_01_sfnt_off00011e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E91 9932 bytes
SHA-256: 5f9a8e641e309db47329da6aea31c9d0521962b70e7d301797d5daf6c1884f03
font_02_sfnt_off000134bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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