Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6eaea61f2d51633…

MALICIOUS

PDF

82.7 KB Created: 2021-08-22 03:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d37a68e1c24e3c5f1f81c3cae3b71728 SHA-1: 0991d3d2f50f475292cbf54a910ba241412d85fb SHA-256: d6eaea61f2d516338f3048cc853e4ef302a586f169e71111b0a71e7ddaecfffb
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, but the presence of external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/ec3bef02f57c424f430840f5e2058fda/60363827411.pdf In PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/35219859814.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/1fa3603dcbb22794f229e2d957b0f3b3/ritap.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e93b2d2d4a9---52619758756.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/topiwibo.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/54615695183.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/ca2806268f63cc5f0a976494488ee651/jekop.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d4949a8a6---jetewanaboni.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/10586208010.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/48811845366.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a168ae7537e---97673391350.pdfIn PDF document text
    • https://dafelia.com/files/3685878726.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/h3rmj08sh48aves26nc3dvc3b2/67818044800.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/92159153956.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/kuzawamejoz.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/vukejuf.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/11953664298.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/5a9b3ebea66c20046ca3cc82f3dd9328/46503327952.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/asvj1a2884bb905v2fth3jsa84/63667587179.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/5a90b197424ce62d30efafbed8546441/4685041665.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/munojigidegejisugojel.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160faa677f1700---7641638567.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/pubix.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/funalikigojot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+hack+fifa+mobile+20+without+human+verificationPDF 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
stream_004_off0001025b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1025B 20540 bytes
SHA-256: 537deb59092297e383c2778bdcb13af53fb316bbf03d6792ab20bbe8bcbc1336
font_00_sfnt_off0000bc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC38 11152 bytes
SHA-256: 97b52fb84a33c04d905b4e04d5044bfafd3bfe63fae2e382c27e327171ab8a5a
font_01_sfnt_off0000d627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD627 16868 bytes
SHA-256: 45d0e68c1f7ff3add133d536a20a95b9e8f3af54072df1015f287b6b1fe5b46d
font_03_sfnt_off000124c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1