Malicious PDF — malware analysis report

Static analysis result for SHA-256 82643b4bde47750f…

MALICIOUS

PDF

86.2 KB Created: 2021-09-08 14:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 958b65b5687c61ab8c2a97f8b0e41c81 SHA-1: 909b2524b3cf095f9888268a15be9943f7a385a0 SHA-256: 82643b4bde47750f0aafa70411c1cbeeb54d14bf0dae13c67ae41c4e9e19b8c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs and link farms pointing to various domains, many of which are associated with compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or serving a secondary payload. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://laborke.ru/uplcv?utm_term=poverty+statistics+in+south+africa+2019+pdf PDF link annotation
    • http://119pump.net/d/files/xabatu.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/kiwiv.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/53618180566.pdfIn PDF document text
    • http://ruresept.ru/files/file/jerenufibibetaj.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/84765016678.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613036c6c7dcd---weronifapekagejifasebuvin.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161304cff8396a---gelija.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/92622069258.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/lixigerevitoxakam.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/ziwafuwokakir.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/ludiladaz.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/tunotazuwa.pdfIn PDF document text
    • http://etre-belle.su/images/file/68618008256.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/29443525628.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138555d6d7f2---96679497751.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/vodowefopunu.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/witigameded.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/88877824325.pdfIn PDF document text
    • http://vititanon.com/user_img/files/sopiwit.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/707e6ffe66eacdc3fa32c8a91ad02c4f/19259355516.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/zisudevaboferuwobunaniw.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/ninemasomorenepufuv.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/93572427906.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_off0000e4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EC 18944 bytes
SHA-256: 1ceca634fda1a35a89ee03bbcdf44aca560e7d44e50aeeb50ecd9d0e93a57b7d
font_01_sfnt_off00011588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11588 11412 bytes
SHA-256: 1ea70d9ff911abc3a018e6489d0172b86c690dbed6a748e652629ace5d5fc108
font_02_sfnt_off00013096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13096 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1