Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a07809db7da9414…

MALICIOUS

PDF

68.2 KB Created: 2021-09-16 12:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c55c0413835ad82b67212698ccf40007 SHA-1: 0c35d51281ccdaa05c325e2b1169a118c7b91d3e SHA-256: 0a07809db7da94146882b207e5977d8296ac8bf92c0c35d276de0f4b80ed9c2b
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. Several heuristics indicate the PDF acts as a link farm, pointing to compromised WordPress upload storage and other disposable hosting sites. These links likely serve as lures for phishing or to distribute further malware, aligning with a spearphishing attachment attack pattern.

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 http://www.leposeur.fr/site/upload/ckfinder/files/xosilerukozaziruvaxexewo.pdf In PDF document text
    • https://redengewinnt.com/userfiles/file/66020031972.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613edf402510a---25024884895.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/vobepoliwifejebu.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/69671230265.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d5d713c6e---79657570392.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/tosib.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/85395753458.pdfIn PDF document text
    • https://svltv.in/userfiles/files/38895645787.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134aea4d9a7c---8108335403.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/44283291293.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/budafet.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/zelalemamimobokexinar.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/66968344878.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/84342197583.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/zuxoraribawuf.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/zesijusav.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/84059554897.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/84597866104.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/11871565094.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=little+nightmare+2+apkPDF 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_off0000ace3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACE3 15232 bytes
SHA-256: a2eda502e54eda6cf09e909a95adde785f28d2eb7f26bfba9f3035be071ea986
font_01_sfnt_off0000d3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE4 10580 bytes
SHA-256: 564db660091c22ba58253e6cf58de902a86c2a6e6ab1eff177f571ec21fc1aa6