Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a0343f94ff70096…

MALICIOUS

PDF

79.6 KB Created: 2021-09-12 18:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c757ff980e95cb58c7afe24d1b281bc4 SHA-1: 36e6e292e1ba951543aafc69255857c7ddb090d8 SHA-256: 8a0343f94ff70096f755f8b21acadde752ef1a4b9d5ecf8c37ea282b75317823
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it's part of a link farm designed to redirect users. The 'SE_CALLBACK_LURE' heuristic indicates the document prompts users to call a phone number for a deceptive purpose, consistent with callback phishing or tech-support scams. While no scripts were directly extracted, the ML classifier strongly flagged the PDF as malicious, and the overall structure points to a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://pistant.ru/uplcv?utm_term=valkyrie+profile+ps1+iso PDF link annotation
    • https://www.bosingels.nl/ckfinder/userfiles/files/vunulimaxetewel.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/80000997580.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/wasewagerolerusobokuxagiv.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/bidimagagojoxepitowasimip.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/wuwudalodowawiwov.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/25229264732.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/87037739406.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/keloxerubuzuvokigus.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/82283430548.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca0dae526d---91391536667.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/kanaxifetekiguwomi.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/74661138872.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/duzukinumepuxefifug.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/vijedulukudig.pdfIn PDF document text
    • http://teifsepahan.com/files/file/36447694795.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a09730ec2---76277129425.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/piguzidunoxu.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/rijevovapun.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/pojunekeki.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/7f3538162661f0a9c29d6a474f235f43/64123234287.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1631089109.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/tojuderubexudelugedi.pdfIn PDF document text
    • http://davcpundri.com/css/file/58248258495.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/24415583557.pdfIn PDF document text
    • 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_off0000d22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA41 18076 bytes
SHA-256: 526cb98e045c57681be242013a8947fce3c978cac017a6eb0542795f0c2cff75
font_02_sfnt_off00011997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11997 10376 bytes
SHA-256: fdaab6e4c4fd066e1cfb1a77fdf8a4c71d146d90898f0631ffde513972884178

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