Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0737b4e376a3528…

MALICIOUS

PDF

90.8 KB Created: 2021-07-02 13:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73cb0a91b691014526d653dcffae4822 SHA-1: c2776741c0629aabadbf53951ee0304730076688 SHA-256: d0737b4e376a3528841a7149a01947b80fd4da4667ab17b67971039bd43ea94e
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating it is designed to redirect users to potentially malicious websites. The presence of compromised CMS upload links further suggests a phishing or malware distribution vector. ClamAV detection as Pdf.Phishing.Trojan confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://irlanc.ru/uplcv?utm_term=culinary+quiz+questions+and+answers
    • http://garderoba.sk/images/_file/12418097350.pdf
    • http://longvu.vn/Images_upload/files/55688778465.pdf
    • http://tamker.hu/userfiles/file/jilozep.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cc6d5be1708---38086275948.pdf
    • http://galettedesrois.hu/userfiles/file/9001667979.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/f2f143ba8d5457f204cb9ee62f601fda/75797773524.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3460bbde28---82325907312.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/ppd2ji07v0822jr9ufn0elfkv2/mavojipomew.pdf
    • http://cke.hk/userfiles/sidirup.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/bc89a14ed5f1d6bf7b9fdd860cd30eb5/xavobom.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/3ae188bcc846d9677594340c074abe7f/mujulebekukupepabisotowen.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b423221ba9e---polepasarekikipajagagaki.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/ujrf88bsne12s1slutjssckd76/tajide.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/utgu3u0v4oo6jk51agm27n12g0/lasunojukifowewutukedov.pdf
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/vipaluvudosonaminipuw.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984079caa47---37614107458.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160972aad04618---87610954979.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076a24ababb5---ribisava.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4ad62070e---35795817040.pdf
    • http://dreamcatcherltd.com/userfiles/file/67247609199.pdf
    • http://allasclub.com/campannas/file/kigokujomugejabesogigusin.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/jdmlrfiqniro7cerrv0slmoru2/femire.pdf
    • http://circolosilverblufitnessclub.eu/userfiles/files/gekonituforozapunodovazu.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c33d52932e---bevabuwulenalik.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffe4.bin
552b07fce2025189a6f23e8fd7ec56f6621d25f0497da7c80da794c32b44d983
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE4 10780 bytes
font_01_sfnt_off000118c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118C5 16792 bytes
font_02_sfnt_off000130d7.bin
4873d73994db6c3a7ac069a61e9f1d8ed67219192ea29f427586442b8a741b9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x130D7 17420 bytes