Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88d75bf0b00fabe…

MALICIOUS

PDF

85.4 KB Created: 2021-08-12 22:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 36fa56edee64ebc5854b5eee463d97b3 SHA-1: 9eaeacb9d10f1a9f6d493fc21e6383f0a2751358 SHA-256: c88d75bf0b00fabec30d9b80edf446b7747a4a98ca7c3f483ef03c484f63bf87
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable domains. The primary purpose appears to be directing users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://tipsclubcr.com/campannas/file/wuxofu.pdf In PDF document text
    • https://dynasty888.com/image/files/20210806_212154.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/97943254782.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/v0k8dctfm8127udtnft1igb0i4/71695748616.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/9ba483037ccebf701105a41be8139ac1/74730935656.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/27606666071.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/b8e0ac1baff270c500ac4f4e389a4caa/58723285236.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/bojaditojosolagabide.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cad93ebff9---vesopidafakap.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/efe6992c5e7ff046a04ad8526c50c66d/budun.pdfIn PDF document text
    • http://bamila.vn/luutru/files/30682094897.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e21d43e2a---5397618852.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/ve000gvfb4bg4oummgl03eismm/senitoxewuxuri.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/xapomobapuwasopapoloxe.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/2147474957.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/6m9kfr1nubdm3erqna0l71jrkg/50913338808.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/96203028015.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/21927682731.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/92526e12572e3c7ab2a1578f618a107d/93379136612.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/ev9maqdmns48sh36nn5bdvdml0/22079416621.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/57996637642.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/68692801474.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/61687014298.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/37629167199.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=what+should+glucose+tolerance+test+results+bePDF 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_off0000e993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE993 16384 bytes
SHA-256: 7afded099ddda985ae1d456fd11d1b8e97a23233e3ce56d32ee763f5bcda9d57
font_01_sfnt_off00011433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11433 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4A 10788 bytes
SHA-256: d6d312250efe39df65ce343877b8689482e7bd50c6d5b8defe6a3914a45c6e2d

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