Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c91197dbef96a9c…

MALICIOUS

PDF

108.6 KB Created: 2021-07-13 15:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bf9c8ef0fba88ceadbcc62794748ebd2 SHA-1: e0dc070562024eb497f68b52c38a64723b2e9a66 SHA-256: 9c91197dbef96a9c5be98e55447d6b4764eb7fffc6c2b9e884e576bb30a91efa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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://babywagen24.de/userfiles/file/pogizobazelol.pdf In PDF document text
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/17301693708.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/wuxuwidigutoxukowus.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/kedimonoralodo.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/56dbd19ba9a0d18b0287517d3799d9d5/11786019745.pdfIn PDF document text
    • http://abnicum.ru/files/file/71968632978.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/0c108a281db644dae992bcc8cf9a5d16/kinom.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/44489336464.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/90715279429.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/594e0be5dac6e7ffe138541792ca991b/kivifuwik.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/f74e32a7979975fafd8dabb7052381cf/zolixaziwazitorebujamafe.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de27dba48f---19769898420.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/c660d7f70054b394801a879bfcb1ea38/96492769895.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/a646ea0a1e5f505fc3392c9f162135c0/jefagidi.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16075491b1b78d---72588522338.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/2bb8a7179b5a8ae356fd3f84d7fefd5e/10258226707.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/nuwumogofe.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/diximefife.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/48987795642.pdfIn PDF document text
    • https://gomaihoa.net/upload/files/bepebewopenimafax.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/fasugajonumel.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/44936054229.pdfIn PDF document text
    • https://premium-house.uz/images/file/92599062987.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bad710be13f---62232486176.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/bisojosidiguselirubura.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/21869818046.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=court+me+first+meaningPDF 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_off00014611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14611 10640 bytes
SHA-256: c0afac4cefa4bfcf7096eac0eccbae1dd3048fa748991224ba99586de9a278c8
font_01_sfnt_off00015e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E76 17532 bytes
SHA-256: 17b98208768db24ed60a53153c1bb7ca43d0e64732352d14d3db919bd70fd885
font_02_sfnt_off00018b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1