Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d815806bcef3e1…

MALICIOUS

PDF

73.2 KB Created: 2021-09-01 21:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5c710af999ed28b24d8162b3e284f260 SHA-1: e8f0dd7f8d0f642295d72591c669068cbc9ba0e5 SHA-256: b6d815806bcef3e1277b3c0d9a67b581d045905ad8d63be0fdc0dc147bbeedf6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and link farms on disposable hosting indicates a phishing or malware distribution attempt.

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 https://irlanc.ru/uplcv?utm_term=zilpo+scenic+byway PDF link annotation
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608564a11b864---99264371887.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/tegup.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/64615716898.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/wewunejagowuveg.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608607c1afecc---90042576882.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/48b545751c07e6956fd9ce6bd049eb01/46553202187.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/96367958140.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/30286663241.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/5fe287e9c19c1cfece3ec7be00d4da54/28009603271.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/xabifipadasamekuwigosib.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/76228387695.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/pizafokijo.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/75448229809.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/37252335605.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/77907798028.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/dasubuf.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/oiets5c65it33l87tjdt9ob9l1/13722226865.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/d5a51a0087e680e81a05eb4a43344241/60879354426.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fec28dc7d---68460299601.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/58764580393.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1932428e64---97918327655.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070c22f531a9---43070525857.pdfIn PDF document text
    • 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_off0000bf11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF11 10472 bytes
SHA-256: bcbf037049ac85270fdf723ddcbefacbbd070ef43eef84fead4d36ab38e63536
font_01_sfnt_off0000d6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eeed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEED 15800 bytes
SHA-256: d94ef05cbcb725cf8f70d78f7fe41a627012351f6817a9026c6e97cb8f75753a

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