Malicious PDF — malware analysis report

Static analysis result for SHA-256 57dfec601c416ae3…

MALICIOUS

PDF

78.8 KB Created: 2021-09-01 07:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9574781085051a2cb7f06bfd2c964ee5 SHA-1: 0bb9695f8dd3e0cca34b3d14415a87bf61a19133 SHA-256: 57dfec601c416ae3c0eb291929d60285c9e812b92517918e3749a501bab00219
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm or redirection mechanism. The presence of embedded URLs and the overall structure strongly suggest it is used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://infrive.ru/uplcv?utm_term=how+long+does+frozen+cooked+chicken+last PDF link annotation
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c45c6837fde---varononojofutagufopitur.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/49o4rkt75kknarp82816sjn7bb/zajesimaruv.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ee2797685a---gipawatejarizax.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/64941039235.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c28660b7bf0---18156494097.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/cq4bo238s94vm9inku3ut2919f/nilararawumalakuwepel.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/2iafivpbnqk9oon2oqmrsnmtne/sojazetoleruzo.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/19e932861c5ddf51da2c1ec2ad2e357b/dezoris.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f62bf8e5ada10a5a88de88c6b47ef850/diwofokisuzawatew.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607935e33a9bb---26113041054.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/kimejisegogem.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/76446177411dd756d2442e9d80b0a820/lilewaxupulibugakida.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/momof.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/b31a0efe98dafc61752f49ef31e6ab1a/doluxupubekesutoti.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c74e31e044---93229578791.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/wakuvopabe.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/3aca0a58dc96ee455c9769ead2497fb0/51700729956.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/95143952687.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/mozifumawod.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ee20b0d2---bogebixaveba.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/reboson.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/49284161497.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/loduloxola.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/3718203495.pdfIn PDF document text
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/50028615905.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_off0000d191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD191 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A3 16124 bytes
SHA-256: 99089692e7728e8d5310c590949dd291a9fd64eaf76b7c80296d2d06df5254d2
font_02_sfnt_off000112e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E5 10984 bytes
SHA-256: b4a17ef595cab0765bd76be860a4ccf8574b92e7e41d58e0ebd6864585836add

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