Malicious PDF — malware analysis report

Static analysis result for SHA-256 236ddef0696f6622…

MALICIOUS

PDF

106.3 KB Created: 2021-08-06 07:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5bb41ce03024c923a64fdc0ca23efdb1 SHA-1: 0af0a91adef69e06fa32ba6730931f0fbe711d80 SHA-256: 236ddef0696f6622ee3212323841c467750df2578b2551a95fb5edf6e7b769f7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs to execute code. It also functions as a link farm, directing users to multiple compromised websites, likely to facilitate phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=clash+of+clans+base+design+apk+download PDF link annotation
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/5750bbd382b1fac79530817701340e6b/nawariwakekoluxaki.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed49eb4340---30303370704.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608168c8cb747---75599020927.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/viwexalibarurusufiweludot.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/eo7p08t34devjtlf7d173uut48/nawapigirejivelunijexiv.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///25600796623.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/78907248423.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/nerareparaxusez.pdfIn PDF document text
    • http://silver1979.com/upload/file/buwadizogu.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddee7b6e34---lolefib.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609865bdaba98---22429716837.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610aa9766ad90---54874662878.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/soasm39f5momfg4rnmobh7s1c0/kaxitokevazidopito.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/bb3g7m28g0lcf30k1lo4nkvs9e/nubusawupuvovamubuvuwak.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/0eb2d72aa5b809a361061793235c36c0/45185301368.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/xofoziwazevegurerowu.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/71740463188.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/baxamererolaroligabilu.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/duminidolosozetupa.pdfIn PDF document text
    • http://manajrgvaaradhi.com/cms-uploads/files/24442187644.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/sokijafabefatepof.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/13255727202.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/e049bf0332240cabc7fed6ccd0fd45d9/45683120279.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/xijawevajanabiputag.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/dcaf2ad347931d6678a41e5879a0c5f7/87205807655.pdfIn PDF document text
    • http://vhz.cz/user-files/salitakejoxup.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/ruxaxikirefizedaxa.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ac36ce0b8b3---siziz.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000127d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D5 17480 bytes
SHA-256: 4cc778360c57006fd83fdff96601af9493ac25c8a1be8a498f32837020c9c236
font_01_sfnt_off000155cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DD8 5628 bytes
SHA-256: 6e9dacd45dc45315531dce8be30e617a33d377e4bedced8818cca611daf7fcb5
font_03_sfnt_off00018135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18135 11048 bytes
SHA-256: a6f4353c56f5ea5b22a22a61f6f3e9f959fc6a40cf747835d65d14ca6daefb4c

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