Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0ce0a9164b46f75…

MALICIOUS

PDF

75.0 KB Created: 2021-09-13 20:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8047ea23a75c31285459d9ed841a6a76 SHA-1: af297eb85494c34fa4b853fccf00b80506ecfe38 SHA-256: f0ce0a9164b46f758a40f106dd6ed77c46b6ffdc2e7fc61c5fcbdc5a71d1a518
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dierenwinkelindex.nl/images/uploads/33724790394.pdf In PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef55daab60---48498923402.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/77578132380.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/fakatazivikirugi.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/jeripitepabanapexebigix.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/e85930738ca6a606a7a99818c1bf3913/58537298231.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/25628334511.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b814c25619---45024648724.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/sawoxiku.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ni3so8nmlf6fatqsujrvpi7kn6/38930116334.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/255f096c9e3e555b8866425d0bd85bb5/36292823882.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210908155347479.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16138a8b80ef11---42821693586.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/13258413698.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/9955046824.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/zasobenozejefuxegoke.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/091125437056.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/d1cb159e13f336658f7980d69a5cb8a8/18116104080.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/57773622335.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/53938263843.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/suxasixosenapeliwanirop.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/75670661332.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=outlook+contacts+to+androidPDF 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_off0000c4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AC 10448 bytes
SHA-256: eb5a4b4339a83f9a423162ac68360b016a16ce32dcc86db131a9afe1197e6ee1
font_01_sfnt_off0000dc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC84 16244 bytes
SHA-256: 56f8173e4ce275e473cccd4b947a11a6f0ce99fbe1e3cd23c3ad15aaa2b9fe73
font_02_sfnt_off00010667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10667 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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