Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb24aa4366e80ca0…

MALICIOUS

PDF

81.5 KB Created: 2021-07-26 15:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6e5b4d4c5077253f645368d77710bf9f SHA-1: 158362fbdf1efd1ec4d106fe1c4c10125b3f2085 SHA-256: bb24aa4366e80ca0d86eea03a742c5909b6b3ac9d06261004ee6d8b1634ea435
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various websites, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics suggests an attempt to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/dalubuzabugup.pdf In PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/aae75c88888a3db556ac3092b59144a7/1440247189.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/lolegajiluginofulisipenim.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0d883c7fb---zewedit.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a5a237988---toxemoronebutufemuze.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/22073448929.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609447744274d---39214889423.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bewisovofanezuvofovakiwi.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609914ed1d145---26604403510.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16072687b48efe---lazujenutifavineto.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/pv3hva9b8kibh49e6kaphk6i85/zitolidosexexororixu.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607e88003af43---lapuzabivinebuxogiwisi.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/88553336272.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/72841194268.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/4660b88b2171bd21c0eb4d27a5a19a7f/12590775066.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/fdf03e5b80603d9027745b62b953da72/zuzexesu.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/37004689335.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec7481508f---69096549383.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/jamakutaborus.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/74502046811.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba49dd814fd---negudazirifufinu.pdfIn PDF document text
    • http://aquatherm-graz.at/files/71697320554.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/5sh7b1tje4m5ffmdvml5hvr9jl/87443016267.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=am+aur+pm+ka+full+form+hindi+maiPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B7 10540 bytes
SHA-256: a9bb69c267d11b22a11220d7514c5727d19c9f31f7c15be9fd2e6e2f639cb7dd
font_01_sfnt_off0000eb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001037a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037A 16132 bytes
SHA-256: f9d81f8c493c1345cc3b1708a8dfc0c2302d10cb815c4e59a7eeb7bb0e826888
font_03_sfnt_off00012d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2F 1924 bytes
SHA-256: d04d2bde600a167e1f609eef95f6b341e3f95a69f54e34457530835b3c30a63a

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