Malicious PDF — malware analysis report

Static analysis result for SHA-256 edeff60789b2a766…

MALICIOUS

PDF

68.4 KB Created: 2021-09-29 05:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ac7f032261b2baea5602c45db066cd37 SHA-1: 2d6e38c2dcf7ad174f938e6d1b18485faf80c745 SHA-256: edeff60789b2a766d6b6b21191e93d9134ff110f6f89b7ac590c79c2e77aae1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The heuristics indicate the PDF functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting domains, likely to distribute phishing content or manipulate search engine results. No scripts were extracted, and the document body was truncated, preventing a deeper analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://hw-power.com/uploads/ckfiles/files/6137dde4e0375.pdf In PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/4cthshd4luhusmtnhf50qt0ldv/ditiremajasiburus.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/7e264520b3328ae5243a50f6fd5bdd9e/nilawumibutadigafapuxat.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/ripakejosojudiweke.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a91a6c424---mofukonufudomutigomuru.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/4dfdbaed8beafd783283d672b4a0f5aa/zafidapuvubar.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/16901219126.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/tavode.pdfIn PDF document text
    • http://gaudi.tw/upload/files/51730229442.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/77441964205.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/tusidofigomikedeju.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/68218248696.pdfIn PDF document text
    • https://birudongker.com/contents/files/21873873922.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c723be7117---pasolu.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/gagevuxegawovuru.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614a0726d13d9---10848893844.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/zozisovopej.pdfIn PDF document text
    • http://ombs.ru/uploads/files/8463065749.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/84397453101.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/4599535176.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/68327585677.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/wokogup.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/13602180724.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=programming+language+used+for+android+appsPDF 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_off0000ae87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE87 14628 bytes
SHA-256: 66584c40f5acf81ed6fe99a13a24a92dca76c1bed467c421150754c47d148241
font_01_sfnt_off0000d307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD307 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1E 10844 bytes
SHA-256: cf04f1cef63e437d59b9ab36a4bfff0274bc06bc4bb6a301290b49cb96866510