Malicious PDF — malware analysis report

Static analysis result for SHA-256 a30a5c6fc215d17b…

MALICIOUS

PDF

92.5 KB Created: 2021-08-09 05:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7d7fd121db97bebff7fb604757b76927 SHA-1: e24f6c328b3e926f8de470cb5fbec981c5c99323 SHA-256: a30a5c6fc215d17ba929dac5972d4c6dc01d9708bfd6926697b2b82ab8b26b81
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and flagged by an ML classifier. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites hosting other PDF files. The presence of embedded JavaScript suggests potential for malicious code execution within the PDF viewer, while the link farm indicates an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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://coretry.ru/uplcv?utm_term=spectrum+ref+code+s0800 PDF link annotation
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1b065f77c---luwebafamonu.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/tezewotozovitorinafam.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/273074bd53edb969f846860693860001/gekavuwibofowonanigu.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/50734690880.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/zixafurobugeb.pdfIn PDF document text
    • https://lusagroup.mobi/images/website/user/files/84540188749.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c55d119b4fe---xupukefumulu.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/nuvimapamuxigenirat.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/nigibixewigakotorop.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/sosokumotum.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a9729278ef0---3945389982.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/82f0d2fe9fc7fc9ad3430bb91e9054f7/9001197170.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/tuvanoriju.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/piwerodivexalir.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/mubevavibavuwiravilo.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160ee276d15f2e---69551716258.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/498621739.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdd7cafe3b---zoserowu.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/96097008442.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/xogonisu.pdfIn PDF document text
    • https://carlojans.com/cms/file/rozibudimedorifugukilorux.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16086833b5c73c---bepexofevopetovajase.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/6d4d1b15eb1dc26d2f269b0d5f5d4bc4/93863188802.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/pememitapu.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/walasozekekimulewoxaxir.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_off00010556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10556 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D68 17308 bytes
SHA-256: 1ecc0878e7284053ec4343c0fb918257fdb00630f17aeaa02eb0bc8f2dded6b1
font_02_sfnt_off00014a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A3B 10884 bytes
SHA-256: a53acdfb0a273017369ea9d84e8b26371e46ecf79d214e5f809a10fd4b182a1b

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