Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ffee823b4be5a4f…

MALICIOUS

PDF

76.5 KB Created: 2021-09-18 23:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 91082ff7709fdf6e26a608c686880a20 SHA-1: 52c46b8f56a2c3e9b335d1af1e9e5925e92f92c5 SHA-256: 1ffee823b4be5a4f6ca9ee3774e8b6a6427742c84e7c2f206a6fc99ed53bde08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many of which are hosted on disposable domains or point to compromised CMS upload directories. These links are likely intended to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://ketchas.ru/uplcv?utm_term=the+conjuring+2+full+movie+hd PDF link annotation
    • https://ilonew.tasksplan.com/userfiles/files/76017961849.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/jesumumimexolekerofunafi.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/45645640799.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/q7h8pjrar51qcr4lpkg6msk4i5/15616026016.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/10027297760.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ee053231b---kabozewar.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/10434205801.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/84744840716.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/resapejobivetekimu.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/15393787461.pdfIn PDF document text
    • https://stopserv.ru/files/file/pekekowedunupabuj.pdfIn PDF document text
    • https://halkum.rs/files/wesipupa.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/vedogudivoda.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-11/20210911060117738264.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/wuzelibomufawojawapi.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/97988676256.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/terolodepiravi.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/13569472008.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/92101523570.pdfIn PDF document text
    • https://fivetc.net/uploads/files/rejib.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/wejasep.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf18f17af4---nuzorexogafireguw.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/zuxesabimuxipibifo.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_off0000bd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD08 21900 bytes
SHA-256: e1e5b6e07e6bdd1f447c78b04220c0c0d17d3eea45c0e0bdc19329b09dffc73f
font_01_sfnt_off0000f3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B8 10872 bytes
SHA-256: c0dbda89e995999dd9dd8b556e835c46fea773a9c66706d70136e48f6ba58653
font_02_sfnt_off00010c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1