Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1743fe654f6d8c…

MALICIOUS

PDF

95.8 KB Created: 2021-06-29 06:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae9579a64b4ea0baca05b641f798c090 SHA-1: a329519c7855e596270ca2f2c93347e9105632b2 SHA-256: da1743fe654f6d8cd8fce42cac7aea83700f1ac8fd93f08eadf5d7e99b61bd5c
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, while numerous, do not contain executable content themselves but serve as lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://toskov-yordanov.com/userfiles/file/61059288542.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/35e8184d7927c901d611499b5433eed1/siwonitejetef.pdf
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/jogowirevufegifamozuvo.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092e9e5ef054---34661045792.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c00924c8c54---65810398633.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a71b3d3b1ce---70646836335.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/e5002e40c2e4304584b9fd9c04a2a0c3/xifuwe.pdf
    • https://daks-96.com/f/uploads/files/limosazanatozapetinogew.pdf
    • https://aawyx.com/sites/default/imageuser/file/basejidilopexekatupaxod.pdf
    • http://komputerzagrosze.pl/userfiles/file/71054685948.pdf
    • http://szpital-sulecin.pl/images/fckfiles/file/51456483602.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/10852d0a36c9ea4559a88220f606800b/topalorinewu.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081c6b8106fa---61182868534.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735e122f9ac---69441543806.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d756479f1---21662750852.pdf
    • http://hanlacsclub.com/ckupload/files/difad.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ff5206ded---23655842027.pdf
    • https://nepalaviationmuseum.com/userfiles/files/51268796886.pdf
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/didowakasowelen.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/e22e9928314c8a16a72031411551f185/26597390857.pdf
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/xikevetevubakaniwejog.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609db642e1f99---35974959045.pdf
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/69815601087.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccc120099c---sinekuzuzogonenuzoripobo.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f46dbdb67a---71045609250.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=out+of+my+comfort+zone+steve+waugh+pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f882.bin
66b7945b99a9c78025a9a0ace4161995b24b08b80ea391fd428eddc3553bac27
pdf-font-stream PDF embedded font (sfnt) at offset 0xF882 16544 bytes
font_01_sfnt_off00010f45.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F45 16792 bytes
font_02_sfnt_off0001275c.bin
74eebcb951dd6a7df5ea9489ab1c93427b657af9b5b8ca5faa450b6a12549e86
pdf-font-stream PDF embedded font (sfnt) at offset 0x1275C 11380 bytes
font_03_sfnt_off000141f8.bin
0b639c39363ddd0a67f59d94cc6970ec90712c26b8cac6d7109f62eef472383c
pdf-font-stream PDF embedded font (sfnt) at offset 0x141F8 17900 bytes