Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a731102f120ae3f…

MALICIOUS

PDF

89.6 KB Created: 2021-09-01 17:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b7037b0cf201e3b66cf1e0f34a2e1ac4 SHA-1: 9cbd0d13d5d4e212c9884d6aea30ed4383bfc4ea SHA-256: 2a731102f120ae3fb3f67e9ba9e0e6d841d45373b7223132ef38bc8675a84815
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://al-bandak.com/userfiles/file/tutir.pdf In PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ac13452f5---80474446076.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/3d0b64cf9016dece678a64d5a89d6e03/nadikinegig.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d126ad975d---88815417141.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbd346e856---jimas.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160a19936be13a---jilokaweja.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/ziluwinigiligiz.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160828d03752a5---juvixiv.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/9e5c62hk8q00vd8hj9c0ai3hp3/80112920599.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/pulefikes.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5835edd4d---koxori.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/38264535600.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/92536695568.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/bbi98a11f09o1gtvnr1nujpof2/tadalivomisakis.pdfIn PDF document text
    • https://medtek.vn/storage/file/buvosukasavuminemaketeru.pdfIn PDF document text
    • http://mega.kz/media/upload/files/78713251804.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b10c94d69f---dunoredi.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/504c52022803518fba5a4efeeddecc42/kasaxemepopimexex.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/35614207722.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/biwages.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610137a34d4f9---78335136114.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20b01a6dd8---tewigasura.pdfPDF link annotation
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fe2788d02---bixuku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=does+a+comma+come+before+or+after+becausePDF 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_off0000f955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF955 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11167 18184 bytes
SHA-256: b049b4fb81465fe448267a5d450807212d87c9e38a07bea878eb7347c15c8e70
font_02_sfnt_off00013fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FAC 10496 bytes
SHA-256: 4aac8aff7ae93425ed53b18bddb9763e99b918fbe4f1402a6286f8d86470e27f