Malicious PDF — malware analysis report

Static analysis result for SHA-256 318c4609738d3d4f…

MALICIOUS

PDF

102.2 KB Created: 2021-07-10 12:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 51488f37bfe86b2443c529863d34df40 SHA-1: 8bb0f86c17206d02bfa1b96057f309143743f57c SHA-256: 318c4609738d3d4f07fcac84005037829ae3f365b5cb86415cbdcab4bac57fc3
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV specifically flagging it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous embedded URLs that direct users to external sites. Some of these URLs point to compromised WordPress installations, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://infrive.ru/uplcv?utm_term=karl+pearson+coefficient+of+correlation+example PDF link annotation
    • https://thehouseconcert.com/ckfinder/userfiles/files/goxovubifirilokumub.pdfIn PDF document text
    • http://chromoink.com/updates/file/xofoza.pdfIn PDF document text
    • http://yulintimber.cn/d/files/zukomevokuxarudejajad.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/def0c73bf620634779caad0e882d29e9/26652350118.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bcc8e2b8b---91726484630.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/bd07b4f381f8793abf8a25f163fd3118/tunatudodurifi.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608079e2da28d---jiwesemujasuvazigesam.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/e501827fc0456c806f0757f9d09f52b9/gufafewuvowuzifuvotuk.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091c8525a073---patejonasej.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc6e548099---52172017899.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/jiduxotunad.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2e1831a35---fuzokosudoxusudigi.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/71352242863.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfec903a1c---nunematimojaso.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/ur84hgufch1opthrlut57jlavs/sikagapukarirabizetaruz.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/9aa2b22ad5151d055ccde94e92bf308a/zidozorojetisig.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160866b30e7038---samuligaz.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082e36842546---64887607560.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/a3142c49110313343a7c5b6ca3546bf7/94134292444.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/83344423293.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/bbf488e982904403e473b54b43695950/mawiw.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/3iii88iv7427r15qkgcas33t4b/bidipavebep.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b620ca35ffd---18955665340.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/kozuruvexutamexesajowu.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607213b038ec9---58385015149.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_off00012342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12342 10732 bytes
SHA-256: 2ac93e273a00bf8feff61d8f987dd34de40c5d8bf11852a235157a6d7cba29ea
font_01_sfnt_off00013bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BEA 20496 bytes
SHA-256: 94a03e6b5f25739e64badf8f96a3862f129af35635e069e5af4254038c7185fb
font_02_sfnt_off000172cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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