Malicious PDF — malware analysis report

Static analysis result for SHA-256 2da109380ffce73c…

MALICIOUS

PDF

81.4 KB Created: 2021-08-20 11:37:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e72add2046a9c1de8ebf7a1e568207c7 SHA-1: 707b37964c05aeaa93607d9f742d67ee062b9ff2 SHA-256: 2da109380ffce73c9021f575206ccdfdf8e597a400c467d793d82f3ede39fcd6
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a link farm with numerous URLs, many hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is designed to distribute or host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://digicpictures.com/downloads/gizusewis.pdf In PDF document text
    • http://sllight.ru/design/img/upload/file/radatomozevedu.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608208f367dde---momozikugagezup.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/74490115849.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/2fb781e99239f2844eacceb7410a03ce/98952115574.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161003674c0a63---warosokibimi.pdfIn PDF document text
    • https://plasy.com/uploads/file/kutax.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/75275146976.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210726_1BFB652ED5E2AA1D.pdfIn PDF document text
    • http://simonide.org/userfiles/file/64935931126.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/41360990824.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/ec7a9e560c6987744ffbdb35dbf8a459/nixobifimefaja.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/rget8nmmthcl8fal3clgm2pd14/61894629022.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/dc1769cd738b1c4baf0020ceb0c8008c/kegajorolekoferujuv.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/bavevejizedapiran.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/jefakatopaminuwom.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084544905ab5---xudasujanomerawefoxebawiz.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/j56hb98ek5p6nkl2t6em18rqk0/fufopenojuzinuzuzeb.pdfIn PDF document text
    • https://gloriouz.in/ckfinder/userfiles/files/50598261143.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/6621678319.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089a7ea9e9a2---wifesesupibeso.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/xugujitibuzofimoze.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/bv0kpglurcn2h3cm2e0hr289bm/20722678777.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=restaurant+business+plan+ppt+free+downloadPDF 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_off0000dc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC09 10864 bytes
SHA-256: 74e6a49082189a0c5dab39ce3d6cdacb3ad5729019638be91a08e671e4a9d4f6
font_01_sfnt_off0000f517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF517 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D29 16380 bytes
SHA-256: b434ee2e1def902c98f258d3c181e3318cb2caa21f283cbf1fa4dbe5d108fdbf

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