Malicious PDF — malware analysis report

Static analysis result for SHA-256 30c23b6c548bcec8…

MALICIOUS

PDF

92.5 KB Created: 2021-08-10 17:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4f3289a888f867c0ccbc7e4204f31cd5 SHA-1: 7bb559baea52ec788387d9829684d3cfabc785aa SHA-256: 30c23b6c548bcec8cf02f51a8ad0255bc89fd41ecd11b58c9148dcea6d9034fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://wastran.ru/uplcv?utm_term=letter+of+attestation+of+good+character+for+airforce PDF link annotation
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d19fbcc9e---99360079126.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608971bdb3c55---40424677730.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/dd1a3b60695c659151765735d7a6eddf/wajijowijupikaxeruneja.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/6f300ecbf20ec4e73a314f1c3330ae34/pupusebobiliwonupawexap.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/48af53458bf143b615c26f16149b01cb/mimeweralozi.pdfIn PDF document text
    • http://fabtur.ru/upload/files/duvisutexokuzebudir.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/kt83locmsld7paqcguqfcg4cnc/vasetezak.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/papepopamogobot.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/sanewo.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/27983226760.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/jijom.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07e8ab250f---95219660422.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73d9b190d8---bikelususosituleme.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/tirimeloga.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/667404463.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/xefagabiralosatiwuw.pdfIn PDF document text
    • http://rowanfamilyreunion.com/clients/28915/File/dopetejukigotaru.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/jozapogibakusitosezewidis.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/7925046676.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911eb047bc7---49026535496.pdfIn PDF document text
    • http://miltonhigh65.com/clients/874455/File/71766028119.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0c3c18fe3---90674037556.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_off00010654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10654 17028 bytes
SHA-256: ca819f33dcfcc96e95eff76cec04cf1f55f489d8401ec5fd6f09b01c59be1e96
font_01_sfnt_off000132ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CA 10668 bytes
SHA-256: 2652c2723b7870abcabf547d9e768cd1713f926af55b7501145d46114c2a8c02
font_02_sfnt_off00014af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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