Malicious PDF — malware analysis report

Static analysis result for SHA-256 b74580ded48dccce…

MALICIOUS

PDF

75.8 KB Created: 2021-09-21 06:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 997f79fd94f22b2bb36369927dc32ed4 SHA-1: 0cb87e5f985102b331222a56d288342bc6259647 SHA-256: b74580ded48dcccec8a23422ccdfdb739f383f63dfefb242d81384b08dfffdd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised websites and disposable hosting. The embedded URLs and PDF link farm heuristics suggest the primary purpose is to redirect users to external sites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://drafthe.ru/uplcv?utm_term=newt+maze+runner+death+cure PDF link annotation
    • https://firesystem.ro/imagini_ws/41245428367.pdfIn PDF document text
    • http://trivio.it/userfiles/files/6366124212.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/wamatapawuxazefubu.pdfIn PDF document text
    • https://afayl.com/userfiles/file/zuboruvosasetijawet.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/4955939192.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/wesodidepawipu.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144dbca6a609---59277271967.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/lanajagakedogasaxus.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/83997630048.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/geririsojuz.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/papum.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/sipakinemikub.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/vasurozonudaxilosetibo.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/98998716725.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/rajapoxemovamajigimim.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/36804037322.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/19551411244.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/84329004978.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141da7a5ca75---naxiburixodozuguxi.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/95af239d26430cbadee545dc4306cbdb/lagirupolav.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/ponipebiropa.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/lupavatarafo.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/7aadc8f56b82de79668043ff6a8f1b3b/68935383003.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_off0000c6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BA 10432 bytes
SHA-256: 53e883235fbeac9fea53e51384709685029c3235646945bebd3d91deaba3cdf2
font_01_sfnt_off0000de3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64C 16952 bytes
SHA-256: 5e91643a1dfc3d8f699172a8b598a9beb73154e23af78fec1f81165f8ed7d09b