Malicious PDF — malware analysis report

Static analysis result for SHA-256 0838c2cdc9c8f7c2…

MALICIOUS

PDF

134.6 KB Created: 2021-07-31 20:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: df476bf6a3650bc92b5f8e5496e8c7a4 SHA-1: 8790e7b3f04da4f5e5645a651bb1a76fa42bc01d SHA-256: 0838c2cdc9c8f7c2290cc567afd75e5e618c2331c647ca003b36acce3bba5a5b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, and it contains heuristics indicating it's a link farm and a browser extension installation lure. The presence of multiple PDF links, some pointing to compromised CMS uploads, suggests an attempt to redirect users to malicious sites. Although no scripts were directly extracted, the nature of the lure implies potential JavaScript execution or exploitation to achieve its goal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://gyobel.it/public/file/joziturafipasonewaz.pdf In PDF document text
    • https://mobiligennari.com/userfiles/file/47814231447.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/wovolijitejetukeko.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a486ae32ca4---zugujizaxaniwomigigate.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/jamalarawigesaluguwo.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/af6d341a5c830f3420a2c98c3ebd7bc6/nodumanuwigi.pdfIn PDF document text
    • https://pmms-online.com/assets/file/mukedowibakovejo.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/n3r5suqs6ksf3s0frbkpu0u9u4/30230867530.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/wifivuno.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/2857305488.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982bdb25585---koxupopife.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607784c6de1e6---dukagumute.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609152b06bd9b---77541956831.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fded09d58a7---vakezoxiramotigebame.pdfIn PDF document text
    • https://etimes.mn/uploads/files/28148909626.pdfIn PDF document text
    • https://yuss.it/file/lopur.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/c848756cf5b882cc94a6cc369de646b2/65524681625.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/dupewa.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/51929185951.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/6611538061.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/jsknhrbfsbh580ibdm7d4pb3qr/zazoxazomepe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=cuisinart+brew+central+coffee+maker+self+clean+instructionsPDF link annotation
    • 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_off0001a6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6E4 18872 bytes
SHA-256: e2eb4086d5eaad11c2107b4739869c1a8cd979c93fadf299082404936c6877ff
font_01_sfnt_off0001d7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D7AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001efc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EFC5 10944 bytes
SHA-256: 28f2c86117da4264daaa77de46ad1609f7d5320659915256b1fc69c5d891aa8f

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