Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ac85780f4603f68…

MALICIOUS

PDF

81.6 KB Created: 2021-09-02 13:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7ada4b2ab533b5ff92bcf1da893048e9 SHA-1: cbf726c18b42121c5bb37980444094acd04f05c2 SHA-256: 2ac85780f4603f68d39ab455e45a50aab5aa52c59f554a49c6d1a5ead339bc3e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised CMS uploads and disposable hosting, likely to distribute phishing content or malware. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious sites, potentially exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bbfederico2.net/userfiles/file/62069227335.pdf In PDF document text
    • http://nitecoreromania.ro/files/file/tager.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a187f2e1189---84095494877.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15303507054.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/14603649984.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/jebuwiwuz.pdfIn PDF document text
    • http://m2m2design.com/userfiles/84403718323.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/57704976066.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/92334661654.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/firulononotorogisideba.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/gunegevuzozinodog.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/15553685779.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/mezirorutaxiwe.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf0230716e---3680796566.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/bd57b7f886cbda9f5e4721e78250ec4a/rupan.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/sibovifeka.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/43890275412.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb5671a5fe---bebisovekeliz.pdfIn PDF document text
    • http://unityproductions.com/upload/files/48182476783.pdfIn PDF document text
    • http://brukbet.com/user_images/file/41243994174.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc1ddd71c7---8020620606.pdfIn PDF document text
    • https://digireg.com/upload/49473947261.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/5870028163.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/54878552096.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=jvc+tv+manual+turn+onPDF 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_off0000d9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A3 10156 bytes
SHA-256: 6b8fcae20d967359dd6f9c47caffe049901f60f33693da7b5279cc1f885689de
font_01_sfnt_off0000f060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF060 18608 bytes
SHA-256: 1d462b1f21a124e6ba9687564b4b77bc675139bca16dd7ac823ec0560b809cca
font_02_sfnt_off000120d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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