Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a596dc412885388…

MALICIOUS

PDF

69.0 KB Created: 2021-09-06 14:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 41e5f6ea0b8360dad2704ebdc1c3cc2a SHA-1: e8e18bb599d8ec8ff99446dc9f9413dfdcad50a2 SHA-256: 9a596dc4128853880bb1f3d9e5de854d96906e68dc08421d7533b25b624c5788
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF is identified as a phishing lure due to its image-only nature and embedded action trigger, a common tactic for tricking users. It contains a link farm pointing to multiple compromised CMS uploads and disposable hosting sites, indicating a chain of redirects designed to obscure the final malicious destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://osoboebludo.com/ckfinder/userfiles/files/vutanilanapoxanigumob.pdf In PDF document text
    • http://jump360.co/upload/files/20210610033130.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202108281545165979.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f6878fdc7---metegotadebunot.pdfIn PDF document text
    • http://candientuvibra.com/images/file/dozutosetinadotesetotape.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/63343499299.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ef2e9d2f3a09b1a18e07cc11e6e7cb93/bobekopokalopepigelagal.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/jonafi.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1621348354.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b073c6e77---ronifemozuwuvuk.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/gabumufulikamedu.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/jedewaf.pdfIn PDF document text
    • https://studiorampinelli.com/file/34815917022.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160d49803aed69---kemixe.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1612f45f15cd94---walasosopowapifovole.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/xuxixagep.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/gukofoxifenadizup.pdfIn PDF document text
    • http://autofulltravel.com/userfiles/files/lisisufasi.pdfIn PDF document text
    • http://atek-ent.com/upload/file/83424836455.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/1f89c1645312da55da4b291a45ed77e5/turaxewexomi.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/xogirutizupezere.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/botatajiwowojuzarixojozep.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/24974120370.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/45600357574.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/nigaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=super+simple+learning+christmas+worksheetsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB14B 13620 bytes
SHA-256: 65d3b2fc8a2050238c20568d4ee09372176368746ec3fc30d7114807de25484f
font_01_sfnt_off0000d29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29C 11176 bytes
SHA-256: e4cb1fd54b832671f5c166e49e75a0592a4a7ca73c55aa588e6a9199488abc2c
font_02_sfnt_off0000ec9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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