Malicious PDF — malware analysis report

Static analysis result for SHA-256 c87d5f636e0034ce…

MALICIOUS

PDF

77.1 KB Created: 2021-06-28 06:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9467144bf5b9c6b602984f981229739c SHA-1: c6df980065f9ee55e016e8ae3b6813013d94fa7d SHA-256: c87d5f636e0034ce820fdb5d156f7b85b6985c82d48f4955e82053e1af64aa00
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users. Heuristics suggest these links are hosted on disposable or compromised CMS upload directories, increasing the likelihood of phishing or malware delivery. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d564fd9ec8---96973517878.pdf
    • http://parkhigh65.com/clients/4970/File/82628630748.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608172a3eaaa3---9826720677.pdf
    • http://i-dron.cz/data/file/65605704928.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/1a5ee5cea4312aec8d242dbfa0c7e60a/kuzenufexonozeturi.pdf
    • https://abandassociates.com/ckfinder/userfiles/files/loximepevuzokekoboda.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/c9cdf2686d874fd59cbc526ff9cffa94/rifijedumuxunogogadide.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/a62ff4f3e1dd2a35af1bcb76b6edbb95/44848004722.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b60ac112b---sadevu.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/7af2d7522f4851d2228aa96003a7dc63/11749470102.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/tmq3dtr2efmisrj0d5hvfesru4/bulokamajosade.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/77b390bfd54004868dd5943f63a0fd96/13193612208.pdf
    • http://agcslohian.com/userfiles/file/88285798930.pdf
    • https://genegurumiraclehealer.com/userfiles/file/66993390551.pdf
    • https://avonsteel.com/UserFiles/file/logufalimunagefutasojivub.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c65221dabd4---23693189958.pdf
    • http://cichanski.com/Upload/file/1528076265.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9beca223e---xipubutifazaraf.pdf
    • http://bakoca.hu/files/file/tunawizudimaj.pdf
    • http://alexlunacoach.com/img/editor/file/47362972468.pdf
    • http://rokakisreunion.com/clients/a/a8/a85ca1e4cfc2bb88d767af442173b437/File/liboduregubapemonexabaza.pdf
    • http://stardentalcare.org/userfiles/file/21022392046.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+put+more+pdf+files+in+one
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb44.bin
3fa5774314553e728e235bb8c11c341981e1760cc7a9d659586347cdc93577e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB44 10672 bytes
font_01_sfnt_off0000e3af.bin
36172b3f411c66b7cd143c82df7cf879546e1f2a58c1bc3b473685e3867f3904
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AF 16572 bytes
font_02_sfnt_off00010eed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EED 16792 bytes