Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0ccd62e919e212d…

MALICIOUS

PDF

78.1 KB Created: 2021-09-21 03:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c080d1cbc86adacef0c384100a474238 SHA-1: de12bf9b4d83a4f55710e6bf3265f1b3146b042a SHA-256: f0ccd62e919e212d2f9760fea5039798cafc3392800e1680799ca78ac863ade0
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, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous links, including those pointing to compromised CMS upload storage, suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://queure.ru/uplcv?utm_term=what+is+the+collective+noun+of+hills PDF link annotation
    • http://lingeriedediva.com/UploadFile/file/2021090901255973499.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/sojukubolojawiburele.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/panopi.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613db0d863b49---xawumuzosopotipuwivew.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/40860611690.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/87930292626.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/87618649272.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/rotixoxegeza.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/97168392500.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/milejuremonup.pdfIn PDF document text
    • https://gcs.kz/data/content/file/wiruraseduf.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/xisekoxupupofodiwewuruj.pdfIn PDF document text
    • http://coolscape.info/images/files/jisule.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/5185681703.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/80464153051.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/9625359784.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/6cd46389ca13beec358a096a8471bc58/39593361554.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/1b52a249210db03ec34e4ce6a5983354/68176006528.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138372b95774---135706460.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/romunedediluzisarebi.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/10217781202.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16134e87d87101---13192042011.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/90411384716.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_off0000cc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4D 17856 bytes
SHA-256: 54b9c797d87250f12720a8f170ea46663a84c3f3975531b01ed326b61d75f956
font_01_sfnt_off0000faec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11303 10492 bytes
SHA-256: 0b94a81b5f4d46e27c3d2335c903858fa4352df215e8980f7acf1e779a6e14ae

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