Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d0b73e44eb0fbc…

MALICIOUS

PDF

73.4 KB Created: 2021-09-16 23:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e0ab21920d68f8628a65c01d3e3bbc9e SHA-1: c79dbd8bcde6f423de78f49bbbbd8e4d01d3904a SHA-256: 35d0b73e44eb0fbc09d0a9f9e55a6f6417d718791f0e9fad81d4f056a6dde480
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The presence of external URIs and a callback lure suggests the document is designed to trick users into visiting malicious sites or engaging with fraudulent services.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • 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=a+quiet+place+2+full+movie+download+tamilrockers PDF link annotation
    • http://medtravel.pro/images/hand_uploaded/files/dijaluze.pdfIn PDF document text
    • http://runhouchem.com/upload/files/buzovudamitosakometun.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210916055924128.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/kajirijeborana.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/3521598595.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/genulozixujatip.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/47591018850.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/62811054460.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c023248fe4---74151650968.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/99878552732.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/76618145864.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/52778057952.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/dipetos.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/pofasutoledaduxebepog.pdfIn PDF document text
    • http://vucert.vn/uploads/files/furawubureresivuw.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/96744716945.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/94d2443144018f76f3a0bbff4de49c4e/95110857547.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/99248539844.pdfIn PDF document text
    • http://taociren.com/upload/file/210909130913024399wl9okpbk2k5d.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ffa59e659---23453885325.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/pubolosom.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/lodimusaxadif.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/gagarawon.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_off0000ba44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA44 16504 bytes
SHA-256: 33f1df5d77f08ceaaf579e1ccf958eef52d767da4f3d6040ecf28696d44f9895
font_01_sfnt_off0000e4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B0 11372 bytes
SHA-256: 023b9aa4f059e78e72c0692443e398ccd490df2da8be6ca04e6b459e6ba550b5
font_02_sfnt_off0000ff66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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