Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac66bd6d4bbeaf57…

MALICIOUS

PDF

83.0 KB Created: 2021-09-04 11:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 147abc270e081cff4a9399853615e06c SHA-1: d4dcc441037814db4de9087f85f00c72484fe949 SHA-256: ac66bd6d4bbeaf579b43e0f8cd8ab6f582d29d7dbb8cb7446c2f3f0fb61b1edf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, likely intended to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to exploit users seeking specific documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b0272dcaf91---58636299144.pdf In PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/36e2d0daad739eb57d77db17e533da3d/10671276276.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/84889441259.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9642b130d---42752709346.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7df631787---94913914568.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/sevunometebusexodezonijil.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/31393386498.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/e581fb4d2dfc68d9caf2ae54e6e9fed4/ropinolukomuwaxis.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdcb52752e---78568745747.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/semigubefosilejaserosumu.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b874a8f1b98---16754928575.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210715_C76852E390E1132D.pdfIn PDF document text
    • https://afayl.com/userfiles/file/85662712115.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/zibawelimibip.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/21421462120.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160743e3e30667---72722908041.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/3mnqkv3rt7eu7hobnffhjg5o37/33856079167.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/pajuwolisamaronev.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb53e799fec---fulobapajetefinuzoz.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/c1c7aede35e4c46e76f339f43df2135c/52719311858.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16071596d09118---8506122275.pdfIn PDF document text
    • http://0930actress.com/files/files/dubes.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/kebedirani.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/98b4077f00aef2e74f58fc979984c74e/razozab.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/10009143451.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/madifadelorexagitinum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=harrison+manual+of+medicine+pdf+freePDF 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_off0000e044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE044 10772 bytes
SHA-256: 4e8cab8fb1e23ac0329d79009a5ffe27498c95fed07b749c09f7efd9472791c1
font_01_sfnt_off0000f8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EE 17412 bytes
SHA-256: b8cbe9477ca9860aab8dce69103ea8f8b1d9af223672b94514df97a3c328c56d
font_02_sfnt_off00012604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12604 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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