Malicious PDF — malware analysis report

Static analysis result for SHA-256 4174f3a6a94c255b…

MALICIOUS

PDF

83.9 KB Created: 2021-08-07 17:33:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8494f6c76f3585f8430a25529561ddcd SHA-1: 941c5cc9f9e26ead0656257f07aca0da520e9d9f SHA-256: 4174f3a6a94c255bf953e14d5a27051a7661a39588585984bb50ba6bbbdaed65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan distribution attempt. The document leverages SEO poisoning by linking to multiple compromised WordPress sites, disguised as a free printable Halloween word search puzzle. While no scripts were directly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/96c085ff202cb81f72a02f9698539b7c/58072766990.pdf
    • https://zivotzaokny.eu/res/file/64821705260.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607511ef8c49c---sotarakifapa.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/8d0cc31ca7f80eee152b39576a6df385/merutej.pdf
    • http://www.chp.pl/ckfinder/userfiles/files/jolufonovosawa.pdf
    • https://tepihtrava.rs//files/78054514304.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca11a514b2---67340331712.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160767af758683---walewosebaxaba.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/frhs6dclpgdp634b5sp2apm6p7/jeposesogumoxudulu.pdf
    • http://bebelino.ru/userfiles/file/69260752311.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/e8545c6d4550b4ecaa45f97a082e7b60/puduxojukasukepobagimog.pdf
    • http://kmkonsult.cz/userfiles/file/46502070610.pdf
    • http://kompletucetnictvi.cz/files/file/viwikajoxizuni.pdf
    • http://sequirk.ie/userfiles/file/37352329227.pdf
    • http://oticonshop.com/ckfinder/userfiles/files/visifikajivawa.pdf
    • http://farashimirooz.com/files/vomojexepulikodapibogorib.pdf
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/mipijebe.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/tuvafosojikezamuwegotaket.pdf
    • http://cherryontop.pl/upload/fotki/file/24839239900.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b37a86599bf---lovuditiji.pdf
    • http://myhomeinparis.com/userfiles/files/pilir.pdf
    • http://cortabellanews.com/userimages/62590070932.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83ada68b8---penebabafasolom.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=free+printable+halloween+word+search+puzzles+for+adults
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e367.bin
c1b3b155ae3100f226af42c9a2b6b7a2a86ff56d5dff8e197b52938480797b8d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE367 11080 bytes
font_01_sfnt_off0000fd03.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD03 16792 bytes
font_02_sfnt_off00011515.bin
bf8140f2624fb9eda43c0efb9962426bc53730bd3900dcf9521085a4c9db3e76
pdf-font-stream PDF embedded font (sfnt) at offset 0x11515 16644 bytes