Malicious PDF — malware analysis report

Static analysis result for SHA-256 afe17515a8c31152…

MALICIOUS

PDF

80.2 KB Created: 2021-09-04 11:38:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6ac8b40599af130b9a9241c97f824cba SHA-1: 37e38ff2fe23088d7ca98892090795e1ce589b80 SHA-256: afe17515a8c31152d0007b8784b27a88bb80dc45abfe2e1bda91038fd4b4afa6
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classification and ClamAV, with heuristics indicating it functions as a link farm pointing to compromised or disposable hosting. The presence of a 'download button' lure suggests a phishing or social engineering attempt to trick users into clicking malicious links. The URLs extracted are likely part of this distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=silent+letters+mb+worksheets PDF link annotation
    • http://lorichphoto.com/pictures/file/nubutaninomemeraj.pdfIn PDF document text
    • http://centronegozi.com/public/ritagavabu.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf946ebbc7---16097780264.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/9427629590.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/36a14e51c742acdca61b9bbb68c0a682/bagibodilegotapotuwe.pdfIn PDF document text
    • http://ipllaser.in/uploads/33457400722.pdfIn PDF document text
    • https://adreshosting.com/calisma2/files/uploads/valoj.pdfIn PDF document text
    • http://askaudit.ru/price/rativevivifaxubolalamo.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/dj88rgeukfk054ubfon88v0kj7/kokixerifoligiluxi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128dc29edf30---969538406.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/golupakijobug.pdfIn PDF document text
    • http://rurisnet.org/images/file/keluzikorosakoxogo.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/11756307764.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/deb2ab85d318344c29addcee1a50a6f9/80351552014.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/e0e30121339eaeb6f14379da91075ddc/loxotuxemakugu.pdfIn PDF document text
    • http://rhondachem.com/d/files/24340103008.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/jogawibud.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/kulug.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/wekibitasipivuxuxaladek.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/lusasiwela.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd614f29e53---midatofupi.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/rexixukuk.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/u77k02p75gm8kiucbb76ovmt6b/47248117848.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/kotudotanekedivix.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/ht811o2m8vk9h9u345dlah8c8s/sokisijetuzedamarulixi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59D 10604 bytes
SHA-256: a2f2a0d4bf231412e8e6456d37b1f30d5e29cfae81f9a95a3e194a929bb2a5eb
font_01_sfnt_off0000eda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA0 17516 bytes
SHA-256: f4d922526f6f93b76da855e8c903b28d54a61f022cbd02e1b5294b6edaccd860
font_02_sfnt_off00011af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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