Malicious PDF — malware analysis report

Static analysis result for SHA-256 85227357641a04c5…

MALICIOUS

PDF

78.7 KB Created: 2021-08-16 22:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 83468527c36e64aad638c680ca829340 SHA-1: 7fa3d7d70f8dc0ca3f59dd5ab00ba01ee3499330 SHA-256: 85227357641a04c5404557a40319d031901ee04a3e5fde58f456f193355c97ea
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure suggests the document's primary purpose is to redirect users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://protectname.xyz/whoisprivacy/userfiles/files/44703938327.pdf In PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bef73449622---83898720151.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/pedagapasa.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2297f62d67---welawosunifewogakamibono.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/62310796718.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/39949795056.pdfIn PDF document text
    • https://sapporopools.com/contents//files/sotevaxekakuri.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/18934866224.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/48332961274.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/kezedovozosenelopilizeza.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/3b42b6db190c55c298dd51f8fe90f4c1/velowa.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/vuvazoninuxididamilo.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/o21e2va51n073446npmn07b6v4/serurona.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/50e3eed18d5bbf0fb39c8def508206cf/zogidudodezawigukowodojej.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/xogoxutet.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/6d271d5ed90162266e7b04ae92b2e309/dixufi.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/e250c67901b817204b26444a0141629a/tubowonewepabagokiraxora.pdfIn PDF document text
    • http://promador.pl/userfiles/file/41476353909.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/24835460802.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/62140998900.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b06c923f583---sojivud.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/87229548860.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/bdcdc01f13dd1e8dfe1d95b8747dc764/81097680016.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/bd032fb005e7f13be5d1998e6ed845dc/burexufolufokejot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=solving+quadratics+by+factoring+and+quadratic+formula+worksheet+answersPDF 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_off0000cc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC19 17124 bytes
SHA-256: 9df68bebc0014b034954c0b75459c5286cc2340e31640343c5468fe400ecc0b8
font_01_sfnt_off0000f91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91B 11740 bytes
SHA-256: 95e1540606068d2f6c20f396a1b56e98f61d75fea8f9386cee24120ca2040705
font_02_sfnt_off0001148c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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