Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb9475fb2374fab3…

MALICIOUS

PDF

89.5 KB Created: 2021-08-30 21:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d8aef02eb2ccc04bcba9802c18e481a6 SHA-1: e283fbcc02e06fda8707724379372fca075f85d5 SHA-256: bb9475fb2374fab36fab50259018b23f902222bf05210603342bee702030d355
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a visual download button lure further supports the attack pattern of tricking users into downloading potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=xray+texture+pack+1.8+download PDF link annotation
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e417c389686---27399040323.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fd25aa0fd0e---kagaw.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/c4q5en5bv0rhpdqkip7dogh4g6/30261575673.pdfIn PDF document text
    • http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/84608715460.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/91507358801.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/waselolofive.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16085fc8192d3b---53813414407.pdfIn PDF document text
    • http://altinay-law.com/images/file/73955261613.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/89675307692.pdfIn PDF document text
    • https://autoskola-scp.com/files/latokutufubumabagujaliz.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/kofawedikebafivubirojogo.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/36715697091.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779072b8cf1---900143378.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/51rch5m0r5kr8n87892tri4ma3/78356385648.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16094db0fe8b62---97075710877.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/87512288945.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/nipelitekexusanev.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/56465168283.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/60992239489.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/sexoluxakoxolevuwi.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/zufozobijebanurajixi.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/16346214256.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/pisedikod.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/tigakubedojowometagaf.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_off0000f43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4D 18552 bytes
SHA-256: 53f90421288df52496de33558c490ada8d64124f41b622a437d0f8856b23f880
font_02_sfnt_off00013cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBE 11072 bytes
SHA-256: 91cba4829f52ef41b32964e5df6c2f826629bd9b6a8facd5b1c78ee324059532