Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5cf54a85725251c…

MALICIOUS

PDF

88.8 KB Created: 2021-08-10 13:40:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: add039233fb0b800cb30359b66092f07 SHA-1: b86b0b81cb7d05aced7706e95e3cf1ab07bb5c14 SHA-256: e5cf54a85725251c7864b001b4e9b8c87c4c1afaf7f7a142f96403a1416ce6d7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it exhibits characteristics of a fake CAPTCHA lure. The document contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting an attempt to distribute further malicious content or phish for credentials. The presence of external URIs and link farms indicates a likely distribution mechanism for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://takeacode.com/user/d41d8cd98f00b204e9800998ecf8427e/file/38404031106.pdf In PDF document text
    • https://bednidhitraders.com/userfiles/file/xiwadudowufulivaxuzazi.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/setiperodukasujolozulaw.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160727f09a89f3---54675937528.pdfIn PDF document text
    • https://bloc-immo.com/images/20657979596.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3f5eb336c---sujewalo.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media//55048099476.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/mj9vj9r1gu2odq55nlk0g6a1ss/nupidasi.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/zuponusuzuvokoronobog.pdfIn PDF document text
    • http://industrialdevices.in/uploads/jazoxipeparefejo.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/9154574364.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/jecoi9ecc4naps3bc48codo544/mexaxirepaliv.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/e9855c0c8d1251e0ac25ef2e71abbd99/18085869552.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/c4a477f19262dc648b0f10dbd9a4239e/kabujinaz.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c65ddcde192---rusamebopubosotipopabobe.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/fb295a84a43f6a8a9c8b4bf2bcef6ca6/79304331016.pdfIn PDF document text
    • http://computerdoki.hu/user/file/92957637648.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/172qb97v6tb7mk7k55s1ub02im/gujafuzewafivelugowafowu.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/c61905e6e53407a8f7847d1e36b9a482/gorobogigitipe.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/4aa5a9fb466ff423f4b0244b853a442d/dadavuredufiginedilikup.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/jeveje.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/77206432908.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609271f362dfb---11063601811.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/nebojerowedewofitifaxuzew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=free+gems+and+gold+for+clash+royale+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB4 11268 bytes
SHA-256: c7b4cd52670da43983fae56c1064837b3fa682f20dbbb3c6d613c7afb2b7140f
font_02_sfnt_off000128ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CE 17024 bytes
SHA-256: e8bb1116a02afa8dc8c6a2c4985470cafcd016fa658ddceea9d7a68bfd9d057d

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