Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a51b02184ce9c43…

MALICIOUS

PDF

80.3 KB Created: 2021-09-15 22:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6487ad11310a60830bb6c2513a1c3b13 SHA-1: 03b9d02e9d11d4d26242010b5761a1362afb1f3e SHA-256: 7a51b02184ce9c438bdc8ca2c1b9eda78136953726935144236f077cbd510c99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://coretry.ru/uplcv?utm_term=how+to+hack+snapchat+account+password PDF link annotation
    • https://aiwatopup.com/ckfinder/userfiles/files/wokezadeximuxorekepesaru.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/mupogonezelaxireli.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ffaa3fe12---kojalanav.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/66506923226.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/7122924165.pdfIn PDF document text
    • https://jurad.eu/files/file/8530144346.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/18647873581.pdfIn PDF document text
    • http://dr-temt.ru/images/file/pubidure.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/77646743690.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/mupanekesawewiz.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/xofugab.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/wozemaledonoritozojoxuvol.pdfIn PDF document text
    • http://koutingchina.com/upload/files/59684631663.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4fe210926---gisix.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e00329ded5---mukifo.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/66595064020.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/mokevazomogotofojorefed.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/44841942323.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326214d2c97---83969474737.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/4308196139.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/64011778639.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/79341484758.pdfIn PDF document text
    • https://ipkameros.lt/userfiles/file/girufowofu.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161393438a822f---51695625045.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/naxizukapusag.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_off0000d592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD592 10612 bytes
SHA-256: 29a4c17c2284ecd176a531bf404c9d9f826e1324a33e01a539e1cd41cc5b9d29
font_01_sfnt_off0000edd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E8 17648 bytes
SHA-256: 00caa85cc32259dee49f155fa6ab52dfb45953913440bb90dd4f9884cfef94b1

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