Malicious PDF — malware analysis report

Static analysis result for SHA-256 e54a931850b6d8e3…

MALICIOUS

PDF

81.6 KB Created: 2021-09-11 18:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4ae19adb3176617a3527de3f2b72991e SHA-1: 8d36e93a0d35b2f05cc26f5d927c911ccffea77e SHA-256: e54a931850b6d8e3a1c55c39be8d4dbfe843c46f16e1f7185a9260f03d101b73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://messianic.live/wp-content/plugins/super-forms/uploads/php/files/dc35bf164fa7c9c207ddd9e2a88e215a/252511858.pdf In PDF document text
    • http://emblem4home.com/UserFiles/Member/File/25529212400.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/312539569.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/dobogujisejifadore.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/19276614950.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/89609187623.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/e881802b032f71291dfe399430bc78c9/turumexaz.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/072054032709.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/liwejesite.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/672c64880bff2180deafec60f60a494d/lotitumebi.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/86919640574.pdfIn PDF document text
    • http://tradotel-riviera.com/file/26332883685.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/56807690310.pdfIn PDF document text
    • https://xinpayflow.com/ckfinder/userfiles/files/gimepus.pdfIn PDF document text
    • http://jn-zhsc.com/upload/walojeronixugimeno.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/fodid.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/84742182731.pdfIn PDF document text
    • https://palet-school.com/files/files/laguvifeja.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/43073686546.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/fegatugisigelagizerovesej.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/damud.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae664d1f8d---19432046197.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11737620289.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=delete+all+cache+androidPDF link annotation
    • 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_off0000db9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9A 10300 bytes
SHA-256: f360a6bc670e192ff91e78194a56688464d043d08ab570e78365df9347213750
font_01_sfnt_off0000f2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC1 17896 bytes
SHA-256: a4fb8d3e6a35ec5de0c051d76f91fab42a8dab020012b1fffb13082b42700e0b