Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddef52d72f2bf2b3…

MALICIOUS

PDF

70.2 KB Created: 2021-09-29 13:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: feff151b68329f798c3de8f51c8361a5 SHA-1: 1dc1d6eacea7ff9c472cdd7a7a2a1e7a890669c4 SHA-256: ddef52d72f2bf2b32ee434a1fb070d8c839dada08adf4141d7d4685a2141ca57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, including one with a 'pdf file opener apk' UTM term, suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://krisoc.ru/uplcv?utm_term=pdf+file+opener+apk PDF link annotation
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fenazufebogu.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/82599343429.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/digovebi.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/85697553990.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/sabaxojaxobomesop.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/97466957800.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/ramoxofaludusefed.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6d87ac1c7---xometamototavuterijete.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614250254aad8---1235587368.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/zegesewuwiwozegedovenulir.pdfIn PDF document text
    • http://gro-felix.si/uploads/jixolonoxam.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/gerufosananumakipat.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/gipitubekunaxivi.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/sudor.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374c55efa74---midoj.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/ripogesisijagetaveruzu.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/60933192757.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/pomoredevezumebewaxuk.pdfIn PDF document text
    • https://nocrime.cntwn.org/ckfinder/userfiles/files/98256228436.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/16237753633.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/vamuzomobuj.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/51343150771.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/xasijenipa.pdfIn PDF document text
    • http://hidropro.hu/upload/rowoxufuvowuv.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/86704783575.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_off0000b371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB371 10320 bytes
SHA-256: cb16fffd2f96beee673b6c2c9e8903ae0d1034803d4c0c0bbb1e23bc2384c6d6
font_01_sfnt_off0000cab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB1 15460 bytes
SHA-256: 5cf933eb68005df7a1c330bd742b54014e88b5780524d203b7f94461e21d8c32
font_02_sfnt_off0000f14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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