Malicious PDF — malware analysis report

Static analysis result for SHA-256 c164afc579ee80b7…

MALICIOUS

PDF

83.8 KB Created: 2021-09-19 00:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e2008dfc0faae6c2df81d772ee33061 SHA-1: f589319b941d4c77163f68784eb46b0bf329786a SHA-256: c164afc579ee80b70f5644c5988d005eee91306164ff038224e67cfde8399078
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of an advance-fee scam. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The document's structure and heuristic firings strongly indicate a social engineering lure for financial fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://krisoc.ru/uplcv?utm_term=drawbacks+of+android+phones
    • https://franciscovalles.comtraining.cl/userfiles/files/nisarejiki.pdf
    • http://artpolyclinic.com/file/files/vikujewuligon.pdf
    • http://laihoawedding.com/app/webroot/upload/files/72105395947.pdf
    • http://mentaplywood.com/images_upload/files/42338146090.pdf
    • http://outspokenholland.com/userfiles/fckFile/20210917125325.pdf
    • https://susta.vn/userfiles/file/pekejirufufipixosopefup.pdf
    • https://gplacestracker.com/userfiles/file/lixibofefugu.pdf
    • https://expomediainc.com/upload/file/dunorufazutinilu.pdf
    • http://adhdesign.de/userContent/files/20210831230522-67564477093.pdf
    • http://www.colormotion.cz/UserFiles/file/sememanu.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327348188a7---detomedoribinif.pdf
    • https://copperscraphandlers.com/ckfinder/userfiles/files/67594978781.pdf
    • http://vers-ma.de/userfiles/file/38455377965.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613135be4f159---losotoxulikowolukokibijak.pdf
    • https://deycaterers.com/ckfinder/userfiles/files/lawuxelipimatirogezegoxed.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/281e2ec04990959aea73251f936fc6bf/tibosariv.pdf
    • http://knipia.com/userfiles/file/wumegixozoza.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613677c72ba59---8787044247.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a3d4d2065---juzaxanosoxiduporanel.pdf
    • https://cpc-serbia.org/js/files/99784129682.pdf
    • https://budapestpainter.hu/ckfinder/userfiles/files/liwinapawitivufivetino.pdf
    • http://www.civilhospitalpalampur.in/img/uploads/files/pozafujexusutibapuwuviduv.pdf
    • https://eobliecky.sk/userfiles/file/59813383368.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_off0000e21e.bin
343729a451f6b5b2c3176553de2470afa77a70e950945d1b2d1c6449dce60d14
pdf-font-stream PDF embedded font (sfnt) at offset 0xE21E 10892 bytes
font_01_sfnt_off0000fb1c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1C 16792 bytes
font_02_sfnt_off0001132e.bin
db3abd6624e46aebe3edde884e2b3fe1b7c5e76e0b617a692d1a64dc3a624967
pdf-font-stream PDF embedded font (sfnt) at offset 0x1132E 17748 bytes