Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a6d7ab9aba1d73…

MALICIOUS

PDF

80.9 KB Created: 2021-09-07 01:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6f6a22adb4cf1611884e782398216135 SHA-1: 20844ad6d3ac67ce54a5d43c3a9ee653c69e03a1 SHA-256: c1a6d7ab9aba1d73d7836450575c1f8df8f797d5a0122bb61b2222e49dd3a1ab
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF that impersonates a cloud document lure, a common tactic for phishing or malware delivery. It contains numerous links to external PDFs hosted on various domains, many of which appear to be compromised WordPress sites or disposable hosting. ClamAV detected this as a phishing trojan, and ML classification strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lead the user to download and open further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/jp2o5nvmro6lormc535ndue23m/lafafamiporelolegomazikix.pdf In PDF document text
    • http://abwingsbuffalo.com/uploads/files/68651253502.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/b0d4f3b58604f5ec9589f2391eb5e189/dametilizenafopapavu.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327d89c9ba4---53363089456.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gamoxobox.pdfIn PDF document text
    • https://lecachet.fr/docs/files/rigefowal.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/jazid.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/bolulexajaxavoxipe.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/vojajedoxebanujovusukete.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baad4339a3f---11817186263.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e214b16497---85235200520.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/gaxemodupasanidab.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/juzojegetidu.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608405498bd86---wezeva.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/fumuzojibuvesopimode.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/jipugiza.pdfIn PDF document text
    • https://fivetc.net/uploads/files/pamuwofevewusu.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/xogumijot.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/71af154866459904a2814e7c203092ab/72526913626.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/tapezosomajuroxunezutuf.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/futuboxuwav.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/cbcf1aaa375e98f63b7387f6ecb7f82f/3670637928.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/26739852917.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/folasafunutiwa.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607742cf9218c---nifoxesimubafurelagapopi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=convert+pdf+to+excel+free+without+emailPDF 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_off0000d638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD638 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4F 11100 bytes
SHA-256: 2d9bf035c554de92089885d52458b74013e5ac1c40032fa859501f6331c5aac3
font_02_sfnt_off0001080c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080C 17792 bytes
SHA-256: 3b86e7c85699ae312eeb7599cf69c05ebacc12cf33021ead9601ddfa52b6c940

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