Malicious PDF — malware analysis report

Static analysis result for SHA-256 f44f97742fe964d6…

MALICIOUS

PDF

89.3 KB Created: 2021-07-21 02:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 510c15364d2cf89f226cf943a9ab5b5c SHA-1: 00e5e43129e120bf9e6eb34db50417038d0ef0ed SHA-256: f44f97742fe964d6e3076adb138763cbe66590a2aba76bc5eea5f99550abb354
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The document body is unreadable, but the heuristic firings clearly point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/p9noqpmqpjb53rpubh6dnuhb46/sufowisufanev.pdf In PDF document text
    • http://chayka-svg.ru/files/wumizidaxu.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/6d4217bc8ef862e37d43811da25f8af5/dukosorizatixanovoxeduw.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nomidamegotanaxij.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/vanuxukugukum.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/butimizagisipodukib.pdfIn PDF document text
    • http://ge-mak.com/files/lokojorutejijiriji.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/15d038a3dac20d3f333864b5cb465bc3/53529369958.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/fnii48avsl4ao4bsi1d4b00n5f/20789670712.pdfIn PDF document text
    • https://isleo.com/i_photos/file/tagujuzekabokurulakawu.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/7024127940.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/rijolo.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/24502909025.pdfIn PDF document text
    • http://naturallymine-chicago.com/clients/867610/File/gekapulikibivizareg.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/fufawobalaborarik.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cff025caf---26367970061.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/1947724619.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/74239618125.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985bd419c59---jikonisilamixas.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/84861dab13e538b38d9e27ba8af7e488/pulunolatejosid.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832eee7bd98---sazamijuzesizenazapa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=3ds+rom+on+3dsPDF 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_off0000fbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF0 17768 bytes
SHA-256: b3494955fc55e5b430b60b35c335fde1c45daff6e0d1b1a61a0ea85158d0a4a2
font_01_sfnt_off00012ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142CD 9952 bytes
SHA-256: 58bbd4e70be79f65b7b7decf3f82f69e0b4517f8b09a3180c3f243c338e6270f

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