Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd846648f7fdad3a…

MALICIOUS

PDF

80.1 KB Created: 2021-09-03 18:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a77cbc4ced99d830a93627e0b8f0be70 SHA-1: 7d6a1e0e6909019ce6fea7327c38546c4dd1294b SHA-256: cd846648f7fdad3afaab85d7e9a687c3e0e3b317b4f416e0c81c9ba40713eec0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs that point to compromised websites, many of which host other PDF files. This behavior is indicative of a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/3b7fe42b7d518f000889a4a4059d2fd9/tejagowivutumezuxujijoneb.pdf
    • https://tortugafilms.ca/adminfiles/file/xirovix.pdf
    • http://ekonopuntos.com/campannas/file/92314623507.pdf
    • http://falconltd.pl/cache/file/52479247976.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609403ae4c1f2---sipemitukarikebisuwuku.pdf
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/maxagilumibopojavabug.pdf
    • http://goodtraefarm.com/ckupload/files/tejakoredagim.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a415e778438---jekepinazojebenufileziku.pdf
    • https://gencshoworganizasyon.com/upload/ckfinder/files/11701623668.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/75l3l2ajarn9g33pprd5ot2dqc/rilifozufuri.pdf
    • https://invest.pl/userfiles/file/ginakagiloba.pdf
    • http://alexhofford.com/temp/files/file/tusejukavemifatodalifonan.pdf
    • http://erex.hu/upload/file/91083949502.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b5f57406c1---67346257817.pdf
    • http://zonwering-belgie.nl/ckfinder/userfiles/files/zamusuledu.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cadcb549c47---71997866977.pdf
    • https://narimasu-chintai.net/jcfiles/file/dorulajitu.pdf
    • http://ccswcd.com/userfiles/file/gesinu.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/j8hlv7g84249g7er178do59jc3/nedenurujoganelabafo.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/g2hgu238b3sc90kqvir0smi59u/39191152657.pdf
    • http://kcntanduc.vn/img_duhoc/files/44250866757.pdf
    • http://absolutelyneon.com/userfiles/file/guwusulajuku.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/aa6u75j24op7rj8lafmn2ru7me/gidumatakozip.pdf
    • https://equinox-e.com/upload/files/92376497074.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=statistics+for+management+and+economics+abbreviated+10th+edition+pdf
    • 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_off0000d140.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD140 16792 bytes
font_01_sfnt_off0000e952.bin
90f8f39418479d54cfa8429d0f5bc9021cc82f270ac09e6bde8816c488ca47b1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE952 17664 bytes
font_02_sfnt_off000117c2.bin
30cc70055a0c50842bd7307f9d754632df05a874bd553a2e604dda903515bea6
pdf-font-stream PDF embedded font (sfnt) at offset 0x117C2 11476 bytes