Malicious PDF — malware analysis report

Static analysis result for SHA-256 7178d83f7af0a09e…

MALICIOUS

PDF

68.4 KB Created: 2021-09-27 08:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a9148b34ece8706554e90c8eac821f21 SHA-1: a73b028b411582a3ec4866dae1c6018704ea0869 SHA-256: 7178d83f7af0a09ea174ee2cba2c9c23480be0bef980e2178dee7bb58cd7c949
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, pointing to numerous external URLs, some hosted on compromised WordPress sites. The presence of multiple PDF link farm indicators suggests a deliberate attempt to manipulate search results or distribute malicious content through a network of linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://iword.de/userfiles/file/samesidepuziwazawet.pdf In PDF document text
    • https://sabresources.com/FCKuploads/file/80528340455.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/49771923155.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/61490214335.pdfIn PDF document text
    • https://mcsfood.com/images/file/35568819725.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbeb644459---lugolotusagofikefurasip.pdfIn PDF document text
    • http://kelt.pl/userfiles/file/dituzemapogipevudir.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/mewaregejopapulozevegeko.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/vepurozegidaketadege.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/89397598486.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/93748350330.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/41615928701.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/25224972704.pdfIn PDF document text
    • http://cichanski.com/Upload/file/texilo.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16144877ced027---fagusof.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615137d6731d6---gonitatal.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210920021320.pdfIn PDF document text
    • http://trieuduong.com/images/Download/popuzibuzotafip.pdfIn PDF document text
    • https://huanghecables.com/d/files/95838176245.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/pajibisilotekora.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109121850505240.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/12387811324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=prayer+circle+copy+pastePDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB032 10380 bytes
SHA-256: 6490565aefd758f63f170ab75f74fe10924edbacff168811127a3ecbcc0f3904
font_01_sfnt_off0000c7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D3 14440 bytes
SHA-256: 67c6aa949d60f9b8f27249174f0fd7e9ed8aa3292f30d44caf57e498c1916bbc
font_02_sfnt_off0000ebf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1