Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cdb1993be56ace6…

MALICIOUS

PDF

91.9 KB Created: 2021-06-23 01:37:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 223edd9e2a24e279810b881b43370cda SHA-1: aba7107a77116ebc8a71dfb500981ae98c59972c SHA-256: 7cdb1993be56ace6730d77db474aebf7ad28208b47027d9298f493eb3d916b93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pixomot.ru/uplcv?utm_term=haier+hfc+r407c+manual PDF link annotation
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080539b1d74c---39673597582.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/6268740106.pdfIn PDF document text
    • http://thebestpearsonfamily.com/clients/e/e6/e6a49a9b6fa3fb0349b1957bd02e8b5b/File/6938984298.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098361195676---gizedofigapufiso.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d69e7b4fc2---reniremorit.pdfIn PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/gigil.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/f5e50b0e072492297c2091ab70fefaf2/11255847864.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/50c623c8e3afc325ecd7b5c7c1a01bf1/89819655725.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/74831138830.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/jka0cb09ltjs3l8h1o600a3019/41638049568.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/43922300960.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/0f86b1d0ee017d78ba4cd3d7b2f4d117/7575294345.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/wemeb.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210505223327731.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/509e5e0d83214a8d75454e4eb871c226/suvobipekevefivituwi.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ba2c949dc---58733431249.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F8 3424 bytes
SHA-256: 6337b7510f1c6935bfbb8f49b03cc89765901be4f55943b6cd452e80c59e87f9
font_01_sfnt_off00011247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11247 5216 bytes
SHA-256: 855ba98e58eb14e05e7edd27c1079958f184f2aebb6a1d91e698403ae09e5525
font_02_sfnt_off000123e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E1 12516 bytes
SHA-256: adc8f382e769194065ffcc43ed664f170d733cfb62309353775e3cb52fc6f360
font_03_sfnt_off00014d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D7C 16076 bytes
SHA-256: ebf689d51ed3b58778ccf7ee11078071a21d17262a377a1c882137165fc51b0d

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