Malicious PDF — malware analysis report

Static analysis result for SHA-256 e196daca40f87f0e…

MALICIOUS

PDF

81.7 KB Created: 2021-08-18 12:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1ebc2ec1e5a789b92529fbe8dc4b2106 SHA-1: 1579996f3cea25286cb3606afae29bf02296f584 SHA-256: e196daca40f87f0e3db854d1c3e913513f3e04b9dfca9e83802fd665163520df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely intended to redirect users to malicious content or phishing pages. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting a tactic to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://nomylo.ru/uplcv?utm_term=what+is+the+highest+scoring+game+in+basketball+history PDF link annotation
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/512q7v41kfmnhhg8fiv1iqv83i/61480366074.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/40544210968.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eed488a3f1---diborofujaxalumunoberusu.pdfIn PDF document text
    • https://mattress-leader.com/media/zejotuwuluvefona.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/96650101654.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/2f0a26d2ead44e80ac58218bd8ff9930/997784336.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3b0b4d585---35305321203.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/3831382401e7824e6bb36adcfb8f29a5/45434435948.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/bleuu2olp28atv4hueaa95macq/mekofuse.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a24664f01---18395651724.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/80339389895.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/54565233398.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9ddcc6872---jumatotiba.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/bopepinuleperoxezi.pdfIn PDF document text
    • http://flemisterbauldingfamily.com/clients/8/82/82a21d9598fc66f9117a8fb7222c8fd0/File/99472209163.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076af4bc8f8f---9653549067.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/lonatulaf.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/wudevamuva.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/5e57dae3df3684ac07ad320ba1a18d26/debimasobikovamusemuve.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/21731595000.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/43233924661.pdfIn PDF document text
    • 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_off0000da48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA48 11016 bytes
SHA-256: fb8ec3b2f347fee5d48f2d05ddde2feb637f88b539ae3f20ba018729461431e4
font_01_sfnt_off0000f3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD1 17520 bytes
SHA-256: 38d39adc7731c159ed654760405538594a04b22047b2bb8eb39d16cf513e8aba

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