Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb56430b39ac3150…

MALICIOUS

PDF

93.9 KB Created: 2021-07-19 17:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f312b79f49e09bba017465d138b3dc40 SHA-1: f06764992e4f4595bb8b4298d4c27182c77168b1 SHA-256: bb56430b39ac3150c51bcd46da60c4e891a3079bc6658f4fe513879170b2d00f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/92c159715777548fcbb2b255ede58ebd/newaterajaxabebugimomama.pdf In PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/3e4bed23482fc2952a0a3c100be40282/xiguxenoduvamaw.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/64066661460.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/940f708c917aa55eddbac237103a0469/mosoxotaziso.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/lamajogogena.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/ffeac86dbdca3feaa20fed061b63e30c/76048847174.pdfIn PDF document text
    • https://soechi.net/userfiles/file/683066647.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/fapaparunak.pdfIn PDF document text
    • https://cecprint.com/images/file/15954657556.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/dlq31gh19nkbud9opicu57bul8/timivadov.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/b158a210c11a16ae8d02768345060930/47481585552.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/pimujilamagal.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/58bb5f7d0c1c24aaf9241a22f9df0430/juwat.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/75510061114.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb075a15baa---98606298398.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/wenazo.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/bf17ac659ac696267045b0a0822014a7/vudapofuvevobalirevuke.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0525c05b5---pirajetetolonixo.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/7200850175.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/8d19cc5d0c5cd17b2f95a3d60415d5ee/43641102090.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/44517508926.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077bc8365a10---39486597431.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/kuvopitugiga.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/oliahc2bbhdfsna3uutb087qq0/54786099228.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/14959588206095a6e4a58d7.pdfIn PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/jolavutivipigawas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=worms+eating+rosesPDF 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
stream_003_off00012327.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12327 17956 bytes
SHA-256: 161cf03d53d798c4a6c60dd00b46ed28aa7875a2684bce74f3cb29a7a80ed142
font_00_sfnt_off00010b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9D 10396 bytes
SHA-256: ed43ff97e5fd255febe0acac4f74d6f380cb614111ccf607835008f9b24a7771
font_02_sfnt_off0001525c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1525C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1