Malicious PDF — malware analysis report

Static analysis result for SHA-256 5279c0d176aba91c…

MALICIOUS

PDF

127.8 KB Created: 2021-06-28 19:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3190cc512d16bce43f7e46d8934e3c84 SHA-1: 1577d51ab1cd0391d90b52e741fafc5b582e68b8 SHA-256: 5279c0d176aba91c9e8128830b486a687923fda7d6919457dbb286edaef051a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be redirecting users to malicious content, leveraging a technique often associated with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9813

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 http://xn--k1akb4c.xn--p1ai/userfiles/file/gumupixitejogobunuxoruve.pdf In PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ab3dafdf9---medebesukikarew.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/3150841966.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/4d62cf06b5d907362c569b188d331f8c/21816265049.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/xomopomulemanamipikifole.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/bazuninam.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fc2d19d52---25717547588.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/96039966906.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/gitolozinunilogiperuwim.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734dcdcf5a5---puvilugik.pdfIn PDF document text
    • http://rayanchem.com/d/files/zuxorowagedapisipi.pdfIn PDF document text
    • http://flomojapan.com/upload/files/98396769246.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/rixifew.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/c2829510de8415237c8d7dd058ebdde3/174075244.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/nekapiveval.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/ntd5mo6a2tuefd507tr5g5r2f6/lirelemafejexadag.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/hdvodlls0ndfsm172akohdubsr/95589271700.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c35ac9398---33056390125.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/e1b0da48d18bf3097d0e2f5c638c8ac0/2761678849.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/pipuwunolefozem.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2e8d87a8a---nalavilagapi.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/irezajazibixarit.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b173f282b---wutonulapa.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/965cc284c27b114341ec22182fd19485/28011287348.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d21a4520d5---sitijubosuzepola.pdfIn PDF document text
    • https://puntoagricoltura.it/file/xigoba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=velocity+of+sound+in+solidPDF 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_off00018a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A57 10388 bytes
SHA-256: a3c52072396ed2f2e3ff3cd7930a1287e5a58f1dee4c7554856f1b519d428e8c
font_01_sfnt_off0001a202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A202 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ba14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA14 20896 bytes
SHA-256: 0140d65e4f2391f510560eb12f6de7c5e4c974c44c312274c08a38ecf991aaf4

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