Malicious PDF — malware analysis report

Static analysis result for SHA-256 46bc2cc281807f50…

MALICIOUS

PDF

83.8 KB Created: 2021-09-15 08:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f82fa4710c4415dd59b6b7c177553f06 SHA-1: 5dc09ede1929ae2fbba7d226865597a1f057a9aa SHA-256: 46bc2cc281807f502932fe96fd87a3801024754e513b117430f7c9eb2ff1669d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to exploit users via external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=uninstall+download+manager+android PDF link annotation
    • https://partroyfuneralhome.com/partroy/assets/file/3285442685.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/40277980334.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/72152905148.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/konoduximes.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/kidisigevi.pdfIn PDF document text
    • http://rc-modeller.se/images/file///bujafoxuze.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/semusajib.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/44163952219.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/7142364b7c93bac08a511a47cce9e7f7/89668057052.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/matirixabiruloguxe.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/88142898170.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/negunejilorazu.pdfIn PDF document text
    • http://mlight.cz/archiv/file/9756348567.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/joretafere.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109050923186112.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/568a7d1c417245efa4184bee24d5efd7/fowokibekafaxizeduvufoso.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/jujerejazubisupajijaf.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/60966746665.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/sakuzapopagawexuveretizo.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/povirimav.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1614137ac81cf4---70751269399.pdfIn PDF document text
    • http://chongros.com/userData/board/file/zuzapukosujomizajozo.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/savavof.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/dimuxujuneforemasupese.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_off0000e2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C0 10684 bytes
SHA-256: 995d49ce3e8d77d33f07db94586be1506068b7cea4644c5b939fd5c2008fab50
font_01_sfnt_off0000fb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB07 17940 bytes
SHA-256: b5f262e312ed7dd31ee44bf012ee228082681940c833dd3289bf9c7f33c6a86e
font_02_sfnt_off00012937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12937 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1