Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd8f6fb79a4569a…

MALICIOUS

PDF

88.7 KB Created: 2021-07-16 03:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ca8e94c4001a1ac2c1bea735453ed5bb SHA-1: 6d0f92261349fdf64887f831b7cfcbd0da4d30e2 SHA-256: 3bd8f6fb79a4569a4202ca914cfa415f7e3464fdd15011589bfc5b8b1a281f8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised websites or disposable domains. The primary intent appears to be phishing or directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://crysiq.ru/uplcv?utm_term=free+children%27s+story+book+download+pdf PDF link annotation
    • http://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/15520498931.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b9445724c---rejexamumikuv.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/xuwadivipipe.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/vrh1q4rlcq9ff2rsutk8pt54q9/70615871968.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/99191258618.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/95352786219.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876e801f238---rosidasunagizupezime.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/d2f87502ed8dbd23c1dcca01010362f5/7665600554.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/52449837558.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/xiweledotesoj.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160ade0db4c20e---53165000227.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/zikosa.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/wivorexi.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/menebolikebonatawiderin.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210617163558.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f45d85b21a---lewupadinana.pdfIn PDF document text
    • https://strechybenesov.cz/content/jumamize.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/mmgcn514d9edo3qgum0lt8e06a/vofapajinazeripunovunogen.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/93eaac3354981bec6787cb99b9016eea/pidodifigogajinemefe.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079aa418f9a3---pomijelo.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/spqomajmd94il4cl48keecqh57/15988951566.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_off0000f78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78A 11160 bytes
SHA-256: 35b20d6eaa8a3c277f04050c7b3cf38292897f5ca78d89e537129806ff3e4530
font_01_sfnt_off00011174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11174 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12986 17292 bytes
SHA-256: 3db0e0b3bf2ea3cb44bbbb75aa727858f402a83063180448c16f7f7b05ac8666

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