Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac36599028b8838…

MALICIOUS

PDF

84.1 KB Created: 2021-09-20 11:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1357e072cbf9d2b803521dc2d3e0a519 SHA-1: 0f95e7915cc872942f089ecb6e054ac5cc910f80 SHA-256: aac36599028b8838ec3982987f4dcb33e477df54add7727efe160a1d8b94f0d9
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate maliciousness, classifying it as a phishing or trojan PDF. The primary attack pattern observed is the use of a link farm to direct users to potentially malicious content hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130131722b60---jofakarivobi.pdf In PDF document text
    • http://emeat.ru/var/files/lezirilivadeviwowi.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/80486017055.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/momulakumomativozep.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16146ab577ddd5---49295508898.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/woraburulovorusemaz.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ale29iifh52da471mei1ja5234/pitidurinobeje.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/65103984315.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/lupejejijepafoxu.pdfIn PDF document text
    • https://ebus.myskoolapp.com/FCKeditor/FCKimgUpload/file/76862162864.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/81327444314.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/gawinulurafelalusutek.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/8201835038.pdfIn PDF document text
    • http://medi-sen.com/files/files/tunuzidotirifig.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/73887584284.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/piparesetesupoguvi.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d71781cc7---kawuvexitojefane.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148097db51f0---jijexidaruzure.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-7/20210907022323439620.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/96753766595.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/30559439339.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+setup+adb+on+windows+10PDF 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_off0000e365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE365 18188 bytes
SHA-256: 7185672e3408d1bc7d48bcb196416af515a02771daa6d7b824a522c5542e38fe
font_01_sfnt_off000112c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C8 10728 bytes
SHA-256: 81153c361a6e5c5876000c0f478d32677ff8e2631f04e8b722f536b8dbec9668
font_02_sfnt_off00012b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1