Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1d2633cc3b608b…

MALICIOUS

PDF

83.2 KB Created: 2021-08-15 18:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a9a8e0e843a2a288278fec93627ff562 SHA-1: 747c6459bbdccd2e5ba3236d670567daa19bfe13 SHA-256: 8b1d2633cc3b608b09e8f07230ca12bcbee9cd4f3d60f31fe8f1e40067342c34
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites, some of which are hosted on disposable domains or use SEO manipulation tactics. The PDF's structure suggests it acts as a link farm, likely intended to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7886

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://aristosaigonhotel.vn/uploads/files/xenomerijafike.pdf In PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607597984b7bc---87341179058.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/15481896562.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/94504372803.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/9ca8786b8c99ff3b880c2ab760966d80/nazug.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160886012aafa1---58795948316.pdfIn PDF document text
    • https://efnnma.org/files/file/90847249102.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/84403067984.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/xubizaminojajuta.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/39997864107.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/85ac52d9499161388a2240b36739e169/21150382708.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080e6e3c2fcb---8763917675.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/92865081499.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ffbab571f---37793184751.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/tegilisoretunav.pdfIn PDF document text
    • https://yz-yongzhong.com/upfiles/editor/files/16062172976.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/ribofopetemonosizej.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/worup.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/kunupumapasivusazozaper.pdfIn PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/98172348387.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/xakigi.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085bd8a1243d---depil.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/rq5hc1bc4oc0fnkcv6v231cet2/86657221213.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/7kbiok4frnruc821e2uvkbimn3/xagavepenobemajujakak.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/af62747ce6946961634740af971091f2/bavirerudobakirevawagexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=ambigram+tattoo+creator+online+freePDF link annotation
    • 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_off0000e8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F5 10632 bytes
SHA-256: 76ea186097ec3dc532d18d257049bd65b5ee47a48b8f85d54908117f0d3da50f
font_02_sfnt_off00011942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11942 17848 bytes
SHA-256: edab0a5d591c2c738179bcd6a9810da23cc084b71c234b202150063ef9f2fc2c

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