Malicious PDF — malware analysis report

Static analysis result for SHA-256 588628f169255e7c…

MALICIOUS

PDF

68.8 KB Created: 2021-08-29 21:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ea18f3403bbc80a479f06fc7107aa885 SHA-1: 3a58e55315490b6e1d580baac63ebff5a7ec7b9a SHA-256: 588628f169255e7c502233f4954a1fd8df2393a5d12afa3849d8aa5cbb3b30f9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://bonacorsi.it/file/96747116835.pdf In PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/jaluwaredazurejilujesoru.pdfIn PDF document text
    • http://elyriacatholic1970.com/clients/7/79/79c6984f8945646ae1b55d50a6b4dbab/File/9587309734.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/33385412548.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/woxotaxev.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/16adfe1986732a748bbbed8b9985c117/14553132411.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/32141883961.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/7703297013.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/29794717733.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/21056306258.pdfIn PDF document text
    • http://mopron.ru/upload/files/dapowonufumadezozumamu.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/lekatuzosowiwuf.pdfIn PDF document text
    • http://sam-global.info/files/file/8776100626.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c70bb50e13a---13862153681.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/wogozegi.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f87160b6631---nurijonaxavosopikukusaju.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/29408205738.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/gimomalafurine.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16074c5cb9e877---tosivafogisivefemijurutu.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b2350c502f---kegeber.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/52823204652.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/5812654660.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/1de5949be2653de2e5736386b15d6117/85976865843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+do+you+sell+a+vehicle+without+a+titlePDF 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_off0000b04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB04A 14700 bytes
SHA-256: 1b813b8bc567facbeac44cd753caad3a7153c16981155fd12c26c803d5d966f6
font_01_sfnt_off0000d54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED66 10620 bytes
SHA-256: 9514c79b17670970dedc28a2d5924c01c93ae621fe3eda07ab269023af27f7af