Malicious PDF — malware analysis report

Static analysis result for SHA-256 479c19a08a54ca92…

MALICIOUS

PDF

91.8 KB Created: 2021-06-30 10:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4a6f5d8e2540732ce50fa8bf16b9fa51 SHA-1: 1ffe78a43c63ac82a83c7e4146f162b1b56e3783 SHA-256: 479c19a08a54ca925303a3781a003aa730b21142ad64ba604d55b978c4ee5234
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The presence of these links and the compromised hosting are strong indicators of a phishing or malware distribution attempt.

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 http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/b131e966c59a09a39853a5599e8f94ef/walutawazufidadune.pdf In PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609433800f38d---80450420959.pdfIn PDF document text
    • http://kasargod.net/uploads/file/gixedolawugej.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075e2a25156c---71824637957.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e141b01c6---33624620861.pdfIn PDF document text
    • http://iphysiology.ru/upload/70058546500.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/2kk2cbno4nesv9ol5c3saa6is6/zidakoganotaru.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/74812681362.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607937317b53f---lalibedo.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/f028c6aeaabdfab6df86b4c49bbd81db/87759618479.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/fibib.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073af4de4b02---15789534914.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/imd9eb641a28ekn1b469hi7be8/ruvaxozesakikexabef.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/fe959922664e2aba2ecf545f0ca54bcc/nawisopozuxumobazakukaro.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081f107a0e77---waludogejerozolipoxu.pdfIn PDF document text
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/57196152579.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/c224aae07c78e676411571ba2346c959/29008515864.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a79dc562e83---texutoxazabijit.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16087754deff80---7791267201.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/6c81785c914b317b41324753e98d542e/95278584766.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607661e8a0878---30120873504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=use+vlookup+in+excel+to+compare+two+sheetsPDF 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_off00010217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10217 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A29 17628 bytes
SHA-256: 4df97c76e32bb013cd910ac61eddbc090439c1605433da9afecb997773b603d6
font_02_sfnt_off00014842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14842 11092 bytes
SHA-256: 39a1c6cb02eee4b00d1009f87f3ee8c87616d26d8747b4f1c65a6e5dc3168d6c

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