Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb21aae6f4913296…

MALICIOUS

PDF

108.2 KB Created: 2021-07-22 14:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 91e03370a71206e2ce27a22e1a172f17 SHA-1: 6049ccf53926bd6912e23265364ce2c509366dfa SHA-256: fb21aae6f49132969e98a407b65a0ee6bb1bb62c8fc07bc0d4172164bd54420a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, containing numerous URLs that point to compromised CMS upload storage and disposable hosting. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://corianderedmonton.com/ckfinder/userfiles/files/dijuketoxu.pdf In PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/62468979805.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/98637ee8b7635bd74d71678c5740c69c/5239558679.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c14f50c077---wawubaxa.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160797750c1777---notazeroravaraboreze.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/erfnjcf89oj7vh095k5tmggvq0/62869813914.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/h2n6g33b2jajhu682htcpf6mv2/tejuj.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/xasove.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/9iq15idrd8qkhqv8b1ac2nsk59/wemogatezoz.pdfIn PDF document text
    • http://allasclub.com/campannas/file/lelax.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/dikibuxidiwuxenof.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/e5c68c551ce44e79582eceff512a3c6f/gazelutiku.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/c08e380d9b30a7b788ce1f5229a14557/59677237118.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/7gkfkdiflumuk6g55mhflcbf3s/96698621300.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/kiwiluvinudapujataxopazix.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cebe1224beb---48196764999.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083005391a19---tesiximiw.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/21aab213d0226561c7ed614f04d8b593/xawiwelomupetaluxovaxoral.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/7750b919e85997bc723da738b8f843eb/josafubalupuviral.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cafd92273---sewomaxikojifufemebanaj.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc1dd1b0ac---58282615187.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/bamemefovakiw.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5c6338af0---vuwasiwezelagaxatodezi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=the+four+ps+make+up+the+marketing+mix+which+is+thePDF 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_off00014201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A18 11224 bytes
SHA-256: ace26852f09d214b51f93fa301189e0ad2e1b079827869a7fd2ae0afd4a01699
font_02_sfnt_off0001745b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1745B 17576 bytes
SHA-256: 1043e67e777a9f923f30f0241b53b3feeab8bfef7f3aee3ff184a37f7d8656a0

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