Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c04fe495687e6ed…

MALICIOUS

PDF

92.9 KB Created: 2021-09-03 13:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: fe24598bbd5dd79dac7542a12c5cbdd7 SHA-1: e02085f4f1536bd065aab5fbadc76d76666129c5 SHA-256: 3c04fe495687e6ede2b7f3d6debe78142c1e92e741aaf38868d5648a88a15120
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://wanyuantemple.tw/userfiles/file/nugoxixisejeximixa.pdf In PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086a80158c51---fememisewamur.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/jugotepunisusosefomuwodab.pdfIn PDF document text
    • https://kermanrooz.com/img/files/99354157174.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/d7fb090e898cef143864ba143162d085/89282150420.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/88630742662.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/xitelonudaxutokemewaz.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/86068574701.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/4vgq3hdd67gev6ctalop8ingr8/zotipa.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/lovubusi.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/fa24533c0a87fbacb9987ea08929c0a1/xizur.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc7c563154d---puzudumoladuromani.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebf41c548f---33888563455.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609731c2e0337---74145313059.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/14439991432.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076d2ba4387c---kanefor.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/takutu.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f17a13023---farowujikek.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a922fd5de07---99301397954.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/69040341637.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/riwofovidalifa.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082405ccad2b---41104397445.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/bagaxoris.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/fuzofulonotek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=vocabulary+for+high+school+students+pdf+%D8%AF%D8%A7%D9%86%D9%84%D9%88%D8%AFPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC71 23952 bytes
SHA-256: 19049e920fdeea1ffb296e334ef59d7362147736bf27027beba9c47d755f391c
font_01_sfnt_off0001185a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185A 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_02_sfnt_off00012f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F33 17208 bytes
SHA-256: 6be1ed53ed35952afa8cf363273ef0e21d7253fd42250511edb339f001295c9a
font_03_sfnt_off000148ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148EC 11220 bytes
SHA-256: de91ac101b113e99312eb477224ee89997e4c76a15ddbb766dd92460ca4c8f05