Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d1688cfb59633b…

MALICIOUS

PDF

91.9 KB Created: 2021-07-19 12:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 194ac30a8880ca68812efe798abd5a34 SHA-1: 262f29473ffd6b3f637f50ba4951907ff002a2b3 SHA-256: 42d1688cfb59633b421cf7ca864604988dab993b40baf05d162bf46e319a291f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable domains, indicating a likely phishing or spam campaign. The primary goal appears to be directing users to external malicious content through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://vin-baietii.ro/ckfinder/userfiles/files/wovaridafuposiw.pdf In PDF document text
    • http://amandatravel.com/userfiles/file/13635239635.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/b38383d01bed6bafbfec15adb420b17a/54609102013.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/7175599288.pdfIn PDF document text
    • https://samowar.ch/upload/file/454387559.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/lasunisotapofapapovax.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/susufa.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/vidifij.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/vebituvawenumef.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/21323353848.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/dowozorarema.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/1336b94077f608f403255190ec759363/52478507914.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/65sevn68lrs1aij04jobkrev0e/8596309257.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/8536c3fbf3d11416d0357b023fda3e66/89339526671.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/0f45b6cd6f2876f9adfb2568e873b218/8348677589.pdfIn PDF document text
    • https://jagominum.com/contents//files/383977860.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/blho7krcm8e5tkcohv34b4jp93/50544279124.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/melufuvi.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce986f3645---56871751860.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bubagafukajexapikoluju.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210530_41F85B5AFA7C704C.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/labilelevipenugukuve.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/powas.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab137e8d512---lunen.pdfPDF link annotation
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160826101e4459---ligamesegovewek.pdfIn PDF document text
    • http://davis-wilford.com/clients/5/5d/5d1655677b271656441dfc21bb295863/File/19139166229.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/vugozuzejavoriwedasonowa.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/2266119905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=crinkle+cookies+without+powdered+sugarPDF link annotation
    • 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_off0000ff7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11790 18380 bytes
SHA-256: a4b262bdf7f4c847961bd4c18b730d3f10941cb68fa3245ff055a6b9474851ab
font_02_sfnt_off00014854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14854 11104 bytes
SHA-256: 103b8cd4843e6686c9bc48cb12c907a2e963cee64134fde69bdb05d83464527c