Malicious PDF — malware analysis report

Static analysis result for SHA-256 e086af15a7f55eb5…

MALICIOUS

PDF

103.8 KB Created: 2021-07-23 02:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43a77c0ca3e2c2b171e6f386e89d09d9 SHA-1: e65329d9266850b2dac9b9887f30463218cb7157 SHA-256: e086af15a7f55eb5e1dc642fedc8b430d08fcbcd39f709ffbbfa0d9ad005e2b1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to lure users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9618

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 https://acronimocostanzo.com/userfiles/file/rilagoganosige.pdf
    • http://alkanboya.com/files/file///36326517973.pdf
    • https://mvpartners.be/images/uploadedimages/file/mujutuniwisuruteluno.pdf
    • http://alnoorcity.com/userfiles/file/suvewe.pdf
    • http://scandirent-new.ru/uploads/assets/file/64082602495.pdf
    • http://argyleliquidations.com/userfiles/files/14439393494.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/6cdtr3mjep964oj0phtinp51al/seregiza.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/qb2201ibaqmeh2smrb6httvlc1/mifekoliguwaripujotafe.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160f8ade5e76cb---wodugolibifuzibemu.pdf
    • http://datev.hu/ckfinder/userfiles/files/dosof.pdf
    • https://mgogs.com/mgfiles/file/40047461739.pdf
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/10078798398.pdf
    • http://absolutelyneon.com/userfiles/file/15060531223.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abca453b7d2---povafuvozizuma.pdf
    • http://dgjst.com/upfile/file/xomifosanutekupepumuza.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705cf6502b3---kovavizixodebi.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9161a0f95---xovuvododobenerijolop.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/97b994470fd6fba2ca75fe56adfcb46b/puwelaluzijokidezori.pdf
    • http://broadmoor80.com/clients/866172/File/bozizavodenabunukavab.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bce9a23cfaf---75409995010.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a610ddbf1c3---tiwolidozopagalelugote.pdf
    • http://kulturazebrak.cz/userfiles/muranibesaf.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874006cb2ab---65038350726.pdf
    • https://marblobaths.ph/app/webroot/img/files/60381634659.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/5m2uh3o6u71iio7f72rrnum2gg/xinobebe.pdf
    • http://watthaistuttgart.de/userfiles/file/xageruxujupepunitileb.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=speech+processing+projects+using+matlab+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011678.bin
24f671252b312adf15e6be8143be5a1bddc3e8de388e7f26b27384cb378a0b36
pdf-font-stream PDF embedded font (sfnt) at offset 0x11678 16360 bytes
font_01_sfnt_off00012cf2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF2 16792 bytes
font_02_sfnt_off00014509.bin
d4c0561a52fe43fd6c8b1137cabda0994af006b46aaa0c24f52c525a6a352fa9
pdf-font-stream PDF embedded font (sfnt) at offset 0x14509 11512 bytes
font_03_sfnt_off00015fa0.bin
9cbf92c6d7e2c2e9b1ecda4b0537e4a238bc76390a0e568cd5a52485066c61ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x15FA0 17832 bytes