Malicious PDF — malware analysis report

Static analysis result for SHA-256 416a8ede6be50568…

MALICIOUS

PDF

84.7 KB Created: 2021-09-03 00:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 819fcf7c9b649c654f55c5a252c9f9c2 SHA-1: 91834a4982b214805b790e6fb584d7ba19cff189 SHA-256: 416a8ede6be50568eee916985096123951b7c7e9346e4b7f144c7a1dbe7be7bd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to trick users into downloading further payloads, possibly disguised as a 'math olympiad book'. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://tongchangkj.com/uploadfile/file///2021081305072223.pdf In PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/ug6nl7ctm3h5pqajqiherdbvja/58123774452.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/tivofodoseberol.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/37383375838.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/jusoredo.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/40646975901.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609645918a579---64281261011.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089b82935ae7---jabul.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/tipatenixobobida.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/bezizaluxeduterovatixul.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f578ec0d2f---taxezaladuxomi.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/4a2e611b77b13906bdb31428303a4a5b/96322123604.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/gorixululi.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/40637828412.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/paxuputemobelaza.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732d13b3bbb---xowanalezusakowemivofeb.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/67489436229.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/3c2398498465730070cdc2715535b6db/jojifexapifowomusu.pdfIn PDF document text
    • http://jingtianlawfirm.com/images/uploadfile/files/2242590929.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/35549857725.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/40639636879.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/65900332780.pdfIn PDF document text
    • http://freewest.at/gukosepapemefor.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/rojotojisolegom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=math+olympiad+book+pdf+downloadPDF 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_off0000e541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE541 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD58 10788 bytes
SHA-256: fc41b9c9ecf40a5bfcfd381f1ee8807dde8e62ff95281faefa7703a6010dc0f4
font_02_sfnt_off000115cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CB 18160 bytes
SHA-256: bdab3ffea565099e64d1e28baade831edd32784211e0ae0fb1eaea0f85466b0b

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