Malicious PDF — malware analysis report

Static analysis result for SHA-256 426d9a67698229e9…

MALICIOUS

PDF

82.0 KB Created: 2021-10-05 04:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a51774dbac0e1aaf70452483857cf4c0 SHA-1: 7625b11bdd78f1d66becd5a7de9966031fc7b2a0 SHA-256: 426d9a67698229e9764aa2c5cc70ddb3bf6b8f8f9eb91e4f4cd7de2d96df100c
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to lure users into downloading further malicious content or submitting sensitive information. The presence of multiple external URIs and link farm characteristics strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://queure.ru/uplcv?utm_term=i+would+have+tense PDF link annotation
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ede42d8b2---tewukawifedoxipor.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/xozezi.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e4958ecbc---jefajuwafarixagolemurof.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/5702595984.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/a2644d18d0156c2baaa6d2ec234f09cc/42497164154.pdfIn PDF document text
    • https://asken.as/bilder/file/34537155520.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/lonovadegatajadujorasuvur.pdfIn PDF document text
    • http://anthonygillant.com/userfiles/file/pitiwugujuziporap.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c668b16a3---fivirafewetoxolajadewe.pdfIn PDF document text
    • http://poiskvod.ru/images/file/15747935200.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/60729686547.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/duvenorurepub.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/72316312247.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/sigogoledumabu.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/vubonaradedofataz.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/22423681574.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/87832367586.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/gatujovezuwamuxopimi.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408bd336a59---64820385523.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/fijeli.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/5430209571.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/nowixukevizijomuw.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/f47bcba8e54323f96531976c8d2a7257/dirolozabekukepodo.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/41039881435.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_off0000df82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF82 10356 bytes
SHA-256: fcabdff9d0ea8f73e5650a2cee691f340fb77dd5f6ffa6544959716716189c93
font_01_sfnt_off0000f6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F4 17072 bytes
SHA-256: ef2fb7e8c0e8d5221e19c02f721994fc5aadaf091d03a1d48cccc84e9ce5492f
font_02_sfnt_off000122d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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