Malicious PDF — malware analysis report

Static analysis result for SHA-256 f168fc00d6cb934e…

MALICIOUS

PDF

73.4 KB Created: 2021-09-07 14:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ada399dcf117335cddb161048072031f SHA-1: 6e4f0fb014ee277259a5a8b43113917f8dc376f9 SHA-256: f168fc00d6cb934e25231a7365dc8d91d1bb36c22b38d0b030adf6d9051900d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the primary function is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=servicenow+investor+presentation+pdf PDF link annotation
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/nrcvd4c84alhutumbh63p6kbol/bixirutemubofetax.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/mutav.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/44887790675.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/4cm6k9t4t4ade0mggdeh7d30b6/81319431315.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/xilifesexilogewawub.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/90386120523.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/bb3fb1a0bb6c460ea302f223a8672c77/xavek.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c080912430f---zavusuze.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/18532647223.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/pukowifunibemuwamat.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf93b31aa29---16174564950.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/nidejuketezogezipag.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/9355929318.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/wipidotorapob.pdfIn PDF document text
    • http://jarosi.hu/files/file/sizes.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f729538132---ranunubigijidukanisamatir.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/wukefavuvimu.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202108311548071306.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/nevonakezefoxez.pdfIn PDF document text
    • http://imaginove.eu/data/Files/nodizizewijimazu.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091f1842d98d---34292851641.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136146714f5f---futifazigagataxava.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/0212df126abb32ce9d3d1aae50998566/jarikelakukomurosud.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/pasukirel.pdfIn PDF document text
    • 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_off0000b944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB944 10792 bytes
SHA-256: 8d762b3691cd2a51ec83af1dd3b50c97749b86af4c78bb5c31c2e2cbc94b37b6
font_01_sfnt_off0000d254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD254 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA66 17524 bytes
SHA-256: 4284fcbce197807dc668fa146bbc9199e2e3e528f12a1cc8da77f383a8c321c2

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