Malicious PDF — malware analysis report

Static analysis result for SHA-256 6461a20c6c7a8f96…

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 22:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9b1b6e6e7553cb9f35137dfe21a854c6 SHA-1: 2b6e31aecc6b6e56501005502cdbae8d0768a03a SHA-256: 6461a20c6c7a8f96ebe90796d9d7a1561fee69fd878ad85deb73cbece9a90bb7
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. These links are likely intended to lure users into clicking them, potentially leading to phishing sites or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://centralcogtc.com/uploads/file/95589164028.pdf In PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161165df3153e8---palapinidubis.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/buruwi.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210829172049181321.pdfIn PDF document text
    • http://a899.net/userfiles/file/nufaxax.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210821162425_imrpp5.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/5154945596.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/pibegewe.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117eb98e6818---fivowefupubuvuvewibosi.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/37600687317.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/vazufojavul.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2239e20402---pefegivetakilu.pdfIn PDF document text
    • https://immobiliaresancarlotrieste.it/file/27441202976.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/95f8d820a8139a184fdadaf14338e185/42275703503.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/354251508.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afbe8c93a9---631143312.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/94342acc6cd9315b753391e95d5716e3/safikirajulifefiluxob.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/muporefuj.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/66576325641.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9176e798c---fonipuv.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/vp5hg3ioro2firk94ef300vblf/47477686259.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//77007776353.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bae4e7edf04---doxalapukifixuludadif.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/majipifu.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/21044103256.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/74ipi7dfs1un9m04ip9fq79uvp/12014886492.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/ronajomazovataluf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=tamil+nadu+board+history+books+pdf+download+freePDF 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_off0000dda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA7 18164 bytes
SHA-256: 837f8ed3ba64a745a0901ce927ddfc9d1e5e387de36431343968053b9eb53f5d
font_01_sfnt_off00010d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12568 11260 bytes
SHA-256: 368857c7d65e3d74514f4c1d3b4b87d4de24e223b43cdc86e7a0525eb72617fc

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