Malicious PDF — malware analysis report

Static analysis result for SHA-256 95dcd609ae7bcc2a…

MALICIOUS

PDF

83.5 KB Created: 2021-09-04 12:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 36f4e24d456af1188ee0546f12d568fc SHA-1: f7a97fb1b1db84a08c7fc35aaa2911c1696c7ce2 SHA-256: 95dcd609ae7bcc2aedcd13cd8bd39020bad8e0d8c36442edcad3621093346572
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF link farm heuristics indicates a deliberate attempt to obscure the final destination and potentially distribute malware or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=telling+the+time+worksheets+free
    • http://leinerpakgelatine.com/survey/userfiles/files/jagurititelidufa.pdf
    • http://optikametuje.cz/userfiles/file/xugofokedepolifozetejov.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0be305e47b64e9531c1c91d38b6fdb7d/11437479315.pdf
    • http://adabaskimerkezi.com/upload/file/woromowofenoze.pdf
    • http://msiutilities.biz/documents/91107470391.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161186f3ac5351---64693140012.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160badb6781fd8---fapowaj.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/bb4d1fb0f8b4e384850abe54ae8b4058/98116457126.pdf
    • http://srtprogetti.eu/userfiles/files/nuzemigure.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/80638092133.pdf
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/86595583404.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16102f33048a9f---15568095456.pdf
    • https://internationalmedia.com/userfiles/file/77796013839.pdf
    • http://dichvuhieuchuan.com/upload/files/87429283175.pdf
    • https://bbpartner.cz/userfiles/file/jilivobabi.pdf
    • https://sheenabusesandcoaches.com/userfiles/file/wuxagape.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a94e412ee86---96488833782.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f57c6dc58---ninenemurenixododeg.pdf
    • http://elma1.ru/!upload/files/54776379870.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2b7403aa0---mufinasomasapov.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16128f2f2b2926---muwagiw.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcbd2cd9034---98916545388.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160782d0763a42---11523244038.pdf
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/67439753771.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e002.bin
90668637d3315398d9ada70374e414ee03ff434cf2bb8f6181d6572fd5b4cc8a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE002 18240 bytes
font_01_sfnt_off00010f8c.bin
0fa54ab08c7cbd20039bd4d36e133841c1f8a989f6db79fbbd4b0b87194e05cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8C 10640 bytes
font_02_sfnt_off000127bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x127BF 16792 bytes