Malicious PDF — malware analysis report

Static analysis result for SHA-256 89bf2bd2509f3a7a…

MALICIOUS

PDF

86.2 KB Created: 2021-07-20 02:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 42158718066b70e741ef96de69941174 SHA-1: 0e605bd4b5751fb80023da003dc363550e3ffc29 SHA-256: 89bf2bd2509f3a7af8acbb5d34f0d97372290b98c44b8abfdf0fd4ea3ead72fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/0a818aba30e51c5a01a3ec4322fbfac6/wovawix.pdf In PDF document text
    • http://jrmhandling.nl/upload/file/24447553559.pdfIn PDF document text
    • http://propellerclubsandiego.org/uploads/files/jisiji.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/luzanizame.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e034661272b---97023173854.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/32096911901.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/62568355229.pdfIn PDF document text
    • http://chipmax.in/chipmax/ckfinder/userfiles/files/48486285614.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/bakifo.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/342a446ac6d477e3d4bd7d284ffcf8e1/23016741606.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f44901609---wamixonizajerubof.pdfIn PDF document text
    • http://distributoram.com/files/file/26042431242.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607eedaa3797b---rasekibezejoruroxozefoke.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/b3e3b947b275fee0ea3ee7aed7b82a9f/jetoxavezixaped.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/54806151449.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160d848cb6bccc---12581178446.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/xewuxugiterix.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/291be27eb6621d66166b035cb2a76fe8/gomipudufogodob.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/3536603304.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/tojavuvav.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cec9fff0a5b---59007311924.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/941d7c3b40e70e3afcfa59f01e71dd56/9829823003.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/begit.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa637428a49---fukomeruwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=severe+muscle+fatigue+and+weaknessPDF 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_off0000eedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDF 11120 bytes
SHA-256: 03acc3efe6c4215a6c2bbacd8612afc3226509a48713fce3319a7d3e6b4b5874
font_01_sfnt_off000108a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A5 16396 bytes
SHA-256: 86e3a705b88826f41015fbd87ab9a3ecead347206e2fde6a9e8f72198243c47b
font_02_sfnt_off00013340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13340 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1