Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6d7c51dcbcace0f…

MALICIOUS

PDF

82.4 KB Created: 2021-09-18 01:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9edcb784e5121cce75d7849e63f92e06 SHA-1: 3899b0103d2d74ebcc399cdc36f98cb7d8611d85 SHA-256: e6d7c51dcbcace0f909937a14abbd25c0b51b2874f61bea7a8c2b9dbebe9e4d9
164 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics fired, including PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM, suggesting the PDF is part of a link farm designed to distribute malware or phish users. The presence of a 'download button' lure further supports this. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://archism.ru/uplcv?utm_term=dance+flick+full+movie+download PDF link annotation
    • https://aurorabersinar2.com/contents/files/notabozibe.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/silazizixujixit.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/wibigizebus.pdfIn PDF document text
    • http://grimastone.ru/files/41156070544.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/dapufarofopu.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/42088930035.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/50700302754.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/19243450044.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/ponoxatisinikipe.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/03/83047554313.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145049b27970---43238097992.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614442558040b---56254933569.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/32519894329.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/9275906309.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/9894620319.pdfIn PDF document text
    • http://hzyixiangchem.com/upload/files/68023813855.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/14579459346.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109122321404685.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/09/wewofi.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134eebddb935---logifaw.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/15113696796.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/56881218783.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_off0000ded1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED1 10616 bytes
SHA-256: 30f474700603a8b57942fffd7b4a593c03838421cc507f747d751c12c2dd7fdb
font_01_sfnt_off0000f70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70E 17224 bytes
SHA-256: f95dba4c2821ec848e8e8a429aa3badd37e8debf955c2bdaa05398f84e7d3d95
font_02_sfnt_off000123b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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