Malicious PDF — malware analysis report

Static analysis result for SHA-256 116d6215b0f645d3…

MALICIOUS

PDF

72.8 KB Created: 2021-07-30 16:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 555353616ac7e59366452ffff0e3ebd7 SHA-1: 56b65ab86def393bc6790d4d6087cb98482c9581 SHA-256: 116d6215b0f645d324b3fdbc409c3690e3d83359482619877ecfaad824ed239b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the PDF is part of a link farm, pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://csc010.com/userfiles/file/20210615152939_3vv7bz.pdf In PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5336f478d4---tudinuralazinevitutef.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/82345632670.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/9515039df710dee1013b11cee65c0a78/86083555596.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/gkcc0ojojn48bjo9g7pdrctlug/modutabesufolitapofukete.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/zaruxuweg.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b27b1f37f4---9690171590.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/70730692324.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e773df91601---38736217308.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/41120925755.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/67416291783.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210614014451_j4lg7p.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/b63b4dd3794b75b0741c046f1f1891f7/39580549857.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/86647322131.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/ahtv731vlunql5jt2e2s6784cv/6284961736.pdfIn PDF document text
    • http://edgecs.net/documents/80609126396.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/karawojufuridijofe.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/68674595959.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/a4c606af18b8b6186837c02232352a30/34270721947.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa26102a933---46350024802.pdfIn PDF document text
    • http://slanfusa.org/clients/47225/File/23590101628.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/63876120154.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/69955568199.pdfIn PDF document text
    • http://scro.ru/pic/file/pukewegajawowigexibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=unit+circle+practice+worksheet+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_off0000ba6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD281 16028 bytes
SHA-256: 3140ccf3b5ec5bff50594594d8d3c552a067cb6f99c576769dc036f689558a8d
font_02_sfnt_off0000fc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC18 10900 bytes
SHA-256: 3a9108cb0dacb72b454f09e82f61d5b0791f63f9ff36c7f9b63e31d144333a1a