Malicious PDF — malware analysis report

Static analysis result for SHA-256 f33a89a9fc068b29…

MALICIOUS

PDF

72.4 KB Created: 2021-09-27 04:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cd76b496559151ee4eb0323a440a0e6e SHA-1: 13b670a1c98f3a4e21fbdf236f8adfc7a5b5243c SHA-256: f33a89a9fc068b294287135d40a859640222ae37da4369f980ddb4723bef98b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://huntic.ru/uplcv?utm_term=galaxy+watch+active+2+wear+os PDF link annotation
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/55346741668.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e318cc403---luwenawesifimu.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/84971178290.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/77820306409.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021091307282773499.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/20219251333568935.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/womivesojopisabopu.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16141ec4689b0b---xefavefalozojisasaxazexum.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/7229673011.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/namapuvulozisegef.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210926035345.pdfIn PDF document text
    • http://cx-gl.hu/images/files/34288581309.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/33814223572.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/46484482149.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a80e084b6---davoruranerabu.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/61942233477.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/wapilevumelopison.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/gexigukafomekufubokada.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/44620973446.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/16201741160.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/e06g5r2p36adkhr00bamjqlqle/90177645192.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/kemez.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_off0000b3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD8 17956 bytes
SHA-256: 47052eb9f27437bbefe98236e8cdf6a196f416fccdf453c0d7c8d7d7a8f08fde
font_02_sfnt_off0000faaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAA 10752 bytes
SHA-256: 0c407f6b0d8bedf0c36e0a52c47c85395bd1c05517e125986d649e2c19cf135a