Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5609f36c079f514…

MALICIOUS

PDF

87.0 KB Created: 2021-08-05 03:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6f4745641aa288c5c75924861a93b035 SHA-1: e56e3b3d01f6598208ce2e6e28b34d3b600b3da9 SHA-256: c5609f36c079f514401e4118f821459f58082ec3f3ae6467a1694b5dc2649aa5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, pointing to an attempt to obscure the true destination or leverage link farms for SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://etasystem.net/userfiles/files/3691595811.pdf In PDF document text
    • http://nissanotogovap.com/uploads/images/files/jodidosukenike.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/81201700137.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/sivavasumi.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d76gj4kio8jkl1tpm1hfpe55f3/28029632892.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818f811b4e9---pomiwobitezakogazonawofa.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edbdefb3442---bakafofiwibu.pdfIn PDF document text
    • https://samtee.com/admin/images/file/nuvofovuma.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/18014390082.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/6662168782.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/vetumoginoz.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/levezejagurukus.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/e67594e55f95eeb9e3f564dd1f71659f/buxalunijibew.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160ad733c27963---fonowafebevawufibalo.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b271473785---33654468075.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/sunaxikubud.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/kisusamogemabuno.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/jurazipekifa.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/lsgfk5qeh9q2kl52p7avpgbc15/99413959539.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/48867494954.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11328e7f53---57969499603.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/902ctg4e78v4t78ricb7ad1tak/64523722290.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160760569848f6---rikiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=download+novel+pride+and+prejudice+terjemahan+pdfPDF 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_off0000eb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB42 11100 bytes
SHA-256: 47e3eb998e25d21cc19283b431b2694481f673ae7b0291601cfc314e18def55e
font_01_sfnt_off000104ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFE 17840 bytes
SHA-256: 54fedb262b0399e2cfbad8814792c8e78058db2c7f3035d6fa744d71a03c07ed

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