Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b82820f8eae942…

MALICIOUS

PDF

71.4 KB Created: 2021-08-31 04:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 94281a632f99a59a3170325319809cb0 SHA-1: 74d171bf2520484a5bc2160af58be061338fcbcf SHA-256: d9b82820f8eae94203b254e0e81a578783ba8e35b3ec715c91353065d7d6e88c
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. It contains numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and link farm indicators strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pixomot.ru/uplcv?utm_term=simplest+form+of+cognition PDF link annotation
    • http://proclima-membranes.ru/userfiles/file/57123402793.pdfIn PDF document text
    • http://brlairport.com/images/file/togavuriw.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/57342580559.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/96710455528.pdfIn PDF document text
    • http://firegallery.ru/img/upload/jifufep.pdfIn PDF document text
    • https://anfauglir.com/images/file/64932998522.pdfIn PDF document text
    • http://perrymanreunion.com/clients/f/f8/f8644f0eb9578147d5589f75b8c3e300/File/99555376954.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16092cef32cdb3---nikipigibi.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/78657414309.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/57078790500.pdfIn PDF document text
    • http://aweibel.com/Photo/file/46740084084.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/zotosodipevefififutif.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/191d59b14354cf616ca131b48a594569/mibilol.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161110fc7ea1d8---mogodufe.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/konitotuvijudezez.pdfIn PDF document text
    • http://vlajamo.cz/images/file/88234104849.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16075abcff1d3b---liloxavo.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/606361a4bb67df036e87e33d1b22aa71/78348260431.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/be3f5254526549a18e9318eb01bb24f1/peveme.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/26449127875.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1612d6acf5b84d---64834347974.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/jajowinijubinuponabaga.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/18490798020.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/riritelibudozup.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609845bbdda15---subol.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_off0000b979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB979 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18B 15216 bytes
SHA-256: 962df9f672e2241c3892ad196a04fd6332234826fee9092e2256e8f85f3db47f
font_02_sfnt_off0000f71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71D 10736 bytes
SHA-256: e1f0d0d2af27ca076853c25201e0136ff586f99077471dfd7d8d4a97aad61572

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