Malicious PDF — malware analysis report

Static analysis result for SHA-256 106c38982f151b9e…

MALICIOUS

PDF

78.2 KB Created: 2021-08-27 22:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a4a23ad6398df5885f68e235d307495 SHA-1: a1a165c26102add734717a2add20c86e2dc4dd41 SHA-256: 106c38982f151b9ed31f315d5fdd3ccbf0154d02ae06fefa2473cf44112abab4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised CMS upload storage locations and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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.
  • 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://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/0qhkmrei51ks0mh1tcs2ej8iq0/simezosotisasenudom.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16128fe76a85f9---47110297382.pdf
    • http://x04ydivan.ru/userfiles/file/41195634013.pdf
    • https://taptigrihnirman.com/singhania/downloads/file/kexabaradojefiviwo.pdf
    • https://betenrealestate.com/sites/default/files/file/wotaxutut.pdf
    • https://citronixdeflection.com/nbloom/fckuploads/file/13675461927.pdf
    • https://soalmatematik.com/userfiles/file/japorelepibesubapimutori.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608afa8868ec8---27979162342.pdf
    • http://guojingmall.com/userfiles/file///mebolaxope.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fe72ad0317b---pisixonufirogiw.pdf
    • http://budka39.ru/files/gelirisawoluka.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee416705d5d---14346463822.pdf
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/975d85a117163e443509087f992a3dab/rivut.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160713cc43b85e---31448390510.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/c8d1273bf837ab35bdff592e825347b7/25270223896.pdf
    • http://roocenter.ru/upload/file/notolose.pdf
    • http://christopherdallo.com/file/7800289646.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/09b8c9b839b6f504ca85fd154549487b/64273995532.pdf
    • http://caratow.nl/userfiles/file/zalopagivijuremarar.pdf
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/59979141507.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070a6dd42291---kalilitazare.pdf
    • https://ctners.com/ckfinder/userfiles/files/jujalogezej.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086148924990---watatibofokorodiwozad.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/ietrmp47ra0p7od0mbqbh8fln5/kokepizimazemazokiga.pdf
    • http://dahchen.tw/userfiles/file/dokinok.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=in+a+continuous+frequency+distribution+the+median+is+21
    • 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_off0000c752.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC752 16792 bytes
font_01_sfnt_off0000df69.bin
4ce6f96942610a6563914ec954b392090a78478394b1272d21e796f561ec24bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF69 11320 bytes
font_02_sfnt_off0000f9c5.bin
dee613ee9246e484b1855d70b95b3bcc11c33b284c0833e2394fbb8520d5ae15
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C5 18468 bytes