Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf0a6f464795b72f…

MALICIOUS

PDF

164.7 KB Created: 2021-06-30 02:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b820162f521636312b1b2efcdae12d99 SHA-1: e34d8bcb3e44cdc2bc4f4c3de316790f5e3ddce9 SHA-256: bf0a6f464795b72f9bdd1e6351ced0ee9ecdf688ef22fd91e2c05ba3094480fc
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 WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f3fd056f7---75725869434.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16097d68e0de81---32628682522.pdf
    • http://alphasigmaoverseas.com/userfiles/file/suxibizasojirof.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/2d4f3115fa617c6b5a0a4be2624726a1/dunukanidetipobuwokegute.pdf
    • http://interwork.sk/userfiles/file/96868335260.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/09d56da2e9fba2b7dd80c7286bd9b5cc/25876503947.pdf
    • http://woorymart.com/userData/board/file/40643058576.pdf
    • https://mudraconsultancy.com/uploads/files/korunilugumese.pdf
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/aa5trok8d6nculdepunujb4531/duvuwubodupi.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c219b70ea3c---44337721789.pdf
    • http://bitite.lv/media/txt/122/file/6648574904.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737beabe11e---20505489942.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/1shf31faoeq1vh0g8k47ml2c00/tezitugumoka.pdf
    • http://kanchanaspa.com/ckfinder/userfiles/files/48989701394.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160db3f2368657---fenonugejonixubojonowij.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c69a9bc1c397fcfa41b8d23884e59070/36578338746.pdf
    • http://naucseto.cz/storage/gewizewefusa.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/976e6dd03a9545d9d0bb60957e9dbbc2/vufewepaxanofunebelezila.pdf
    • https://taechoclub.com/FileData/ckfinder/files/20210625_BE679BDC159E601E.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6d0dc07fa---walimaguruxuloz.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/43fa0de870ed478ade933f315e0e81b1/54964536553.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8472326da4---tekawok.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609117b5d3dcc---perugibibutokawi.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbfacd669a---5621582320.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=ruth+3+and+4
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001fdad.bin
5f598a13f5a99090c06e4086a6e5deedf5bceb39bc495d502a2fd2a13c4a1804		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1FDAD 19272 bytes
font_01_sfnt_off00021e4b.bin
d467c7f494e660377231b8a533c33f4c95287a3300d4b4c6f45996d6c20ee632		 pdf-font-stream PDF embedded font (sfnt) at offset 0x21E4B 10080 bytes
font_02_sfnt_off000234b2.bin
08be528f7c3a08d75247c6049226cd3847b239f308087769bc02d619d518e549		 pdf-font-stream PDF embedded font (sfnt) at offset 0x234B2 21776 bytes
font_03_sfnt_off00026b5f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x26B5F 16792 bytes

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