Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05e179891e34a9d…

MALICIOUS

PDF

80.2 KB Created: 2021-09-04 03:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 95a66f8d52102edf2502d48bb95c8331 SHA-1: 5302f1568f3a5207f728c415dcd5ea2a91564df5 SHA-256: c05e179891e34a9d820eef2f747e1cad8c26eaed692d792f96f1688bbf37d8c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the nature of the link farm and the PDF format itself often implies the use of embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ff8991dc0---46811232620.pdf In PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d4cd27dd116031ef82097786cdbea950/37465307742.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/reludikilut.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/16029880717.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/sitezufoberowopasusulof.pdfIn PDF document text
    • http://simpli.ie/survey/userfiles/files/7290850959.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/tenofax.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/96650576433.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/qj6e5ban0brs261lkegu86cup2/xabafexit.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/tokazavageg.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/jatevuwevirelope.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/29b31e19881a6b4feeffb94dfcd37491/80529371188.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984ac4de943---57963617774.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/b132a9c608d80798b2668420ee953f8e/rawokageta.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fe60d7aa1f---vamoj.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/64607255079c34332b65cca77e37e1a5/50817141703.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/gexosuz.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/48719023257.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021081521373373499.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/73096559312.pdfIn PDF document text
    • https://laser123.com/geektic/files/bidigokala.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/jd5md7usfla40p25jluf8cn3k5/kaderakilamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=phormio+terenzio+pdfPDF 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_off0000d576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD576 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED88 17644 bytes
SHA-256: 84ba646b562ad2ae649b40e6067eeb730b14a51e12a34667222d8f4d9bbe31d4
font_02_sfnt_off00011bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC0 10448 bytes
SHA-256: 8c182faf4fb5a85d3aa288d12a90cb8a0ad681050d1966aff2b74d8b12058cb9

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