Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e57f5212b5b2d16…

MALICIOUS

PDF

79.4 KB Created: 2021-09-03 00:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 85dc109ff28a6b0ad341c7b2640fb6db SHA-1: 0c813085f23db7b7e9164c7b02558bcaf4489c07 SHA-256: 2e57f5212b5b2d16a6a3e3ce34b47eed12c641fcc4e3588073b2e8350de70728
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic specifically highlights links to compromised WordPress upload storage, reinforcing the malicious nature of the hosted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cnp-inc.com/ckupload/files/zebapisanugesajepavebe.pdf In PDF document text
    • http://quinta.cl/upload/files/juwikemukezanomudev.pdfIn PDF document text
    • http://flexicourse.cz/res/file/93744328010.pdfIn PDF document text
    • https://red-adlay.com/upload/files/telipinamase.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/92956800150.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/df5ec243d1d8fd7363fcfb8a2321f63e/rutip.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/zipawikidavezezabufe.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abb51eb80ff---xekato.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/9b68bbe6078448b44fc284a5de165e60/jolagitoluguj.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be35a583539---70346824967.pdfIn PDF document text
    • http://roleco.pl/data/aktualnosci_imgs/file/gisupewurogetaguselu.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/juxovetopeg.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/99267121714.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210515013604.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/davugufagafilugewomex.pdfIn PDF document text
    • http://keigan-productions.com/clients/863431/File/69061873443.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/0ed983c19860e176f271835b1dbd0366/wewomeweg.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/89013754868.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a781ababf95---79530115585.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/pgu7q6giog5dp69bke358pjv09/situbewisabaj.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/9a4749087f325e78bc6e16aec71f2fbe/38857701173.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0cb9031294---84326512640.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/7993514316.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210720171034.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/mivikevebajokeboto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=corte+de+nevoa+e+furia+pdf+gr%C3%A1tisPDF 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_off0000cb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB55 19932 bytes
SHA-256: 69c32efde4de8cb32da2b4e2fda3f85aba40c0184a9ffc410986dc72eaba4d66
font_01_sfnt_off0000fc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11493 11004 bytes
SHA-256: d232780d1d00205bb2acc55706cd9341694717e651b9db7254bdf9ebd77b0a79

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