Malicious PDF — malware analysis report

Static analysis result for SHA-256 8de68334314d338d…

MALICIOUS

PDF

68.3 KB Created: 2021-09-10 08:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f3392088a6efa27928102e43932301e SHA-1: 68df1cd814236517b75305b48ab3be229062d5df SHA-256: 8de68334314d338d37a636265f2c9634b75c2de23684a244e89c24eb4f253c97
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a phishing lure using an image-only document with an action trigger. It also features a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://jljemc.com/upload/files/9322189562.pdf
    • http://haliburtonhighlandsheritage.ca/userfiles/file/jisekevadifit.pdf
    • http://banner-ever.com/ckImg/files/96401238889.pdf
    • http://kfbma.org/files/fck/file/powupefanogofetumokufog.pdf
    • http://kidneytracker.com/ckfinder/userfiles/files/zefanitemiperewujogapevu.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136f9017c96e---40366180950.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135afc0c8f9d---68024947726.pdf
    • http://www.keizerco.nl/userFiles/file/pusifumikus.pdf
    • https://abss.pt/userfiles/file/25674597065.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/kevc7frdb0a9ofoca9sappeuq8/zogowafopoparu.pdf
    • http://lideparts.com/userfiles/file/1630632370.pdf
    • http://ahrestygz.com/userfiles/files/20210909_132236.pdf
    • http://mcutech.net/upload/2021/09/file/1630713502325094450.pdf
    • http://shengnabei.com/uploadfile/file///2021090907042040.pdf
    • https://sabunwangi.com/contents/files/lonenofafeluju.pdf
    • https://leciv.fr/uploads/FCK_files/file/lafolawabatonulitebuxax.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161326964028dc---30524169929.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/43abfea9df16cc49ed69bb21b5751fc9/gisikiwagek.pdf
    • http://birnagarcollege.in/userfiles/file/59928844523.pdf
    • http://infoegrafica.com/userfiles/files/82342094914.pdf
    • https://optical-axis.com/uploads/files/202109051826321140.pdf
    • http://855solution.com/htdocs/cljr/data/files/77262029848.pdf
    • https://cplastik.com/data/cms/file/50127141800.pdf
    • http://jeansresource.com/js/ckfinder/userfiles/files/64681664949.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/0d09399ffa0b57349455842e16aee703/pemalosajebuso.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/7aa0dc23cdd400985136cd5afe35a4f9/futikorexi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=nonessential+amino+acids
    • 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_off0000b26f.bin
974326da33061e2c419dc791f59ec900557e09fdad4b4f003aca620d4f49dedc
pdf-font-stream PDF embedded font (sfnt) at offset 0xB26F 13868 bytes
font_01_sfnt_off0000d465.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD465 16792 bytes
font_02_sfnt_off0000ec7c.bin
35b9b324b50f06de7743087ab06c36dc60d21cff81d329d83adabf94c105d953
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7C 10408 bytes