Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b25366f0438a0c1…

MALICIOUS

PDF

83.7 KB Created: 2021-09-23 07:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: df29a8dbaf244d3487e9979f795f2b9f SHA-1: cfb0b6f734621880e450349b368482b5f5ff7e20 SHA-256: 3b25366f0438a0c187a3436992ab46f73fd08db841cfd6582cf1185ad52989e6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple URLs, including one with a 'utm_term' parameter suggesting a lure for a modified APK with unlimited money. Heuristics indicate it's a link farm on disposable hosting and a callback phishing lure, consistent with a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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://coretry.ru/uplcv?utm_term=ufc+mod+apk+unlimited+money PDF link annotation
    • http://escuelasfutbol8.com/docs/files/14231656442.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210908182015_673943271.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/25471037741.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/39831366947.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330c4973188---54457340667.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/xilixobitifokajigazim.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/53852228349.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/52584286397.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/jimowox.pdfIn PDF document text
    • http://cl-pub.com/files/files/79506839673.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/wagud.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144ca05a7763---vawuzogufodawidewerazo.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/seger.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/23155912290.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/64206186038.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/161485a58e6c55---37753382105.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/miwuxawemobo.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d74779a404---dafobifivetezuvegodiruk.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0644f1e25---mukuvilodufusuzodeve.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/8193695095.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/votuwibagigunad.pdfIn PDF document text
    • http://mastervin.ru/files/file/75964114629.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/57127242499.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/59988866964.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/lagajob.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_off0000e297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE297 17696 bytes
SHA-256: 919dd195e412dd4017636a94b70c646e8330307086bdc508ccd40bc147860070
font_01_sfnt_off00011053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11053 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001286a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286A 10828 bytes
SHA-256: 8f80cf6fdad2149587c7ca2c3260b63df23f18b9f24de2da50bcbde56e6f37d5

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