Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d3612fa7fd076fd…

MALICIOUS

PDF

108.7 KB Created: 2021-07-27 16:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 562e747404b58a1d2f1fff2a726af725 SHA-1: 6ff3bb2337c808c002d3f9777aa906b71b8ef47d SHA-256: 9d3612fa7fd076fd48340893e3b9ecb257222d9f07638ea64a6d2b1e2d0c44a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

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 http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/rroejlo0t8m0d4lp3mgtbh2mt7/jenidejetirosol.pdf In PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160985856914f9---9162047429.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ppg1m0hqu4cd0en0lseaks1vb2/76462086632.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/712fc2a4852c3d5c77d5cdacc7e382a3/73432546578.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/99650960008.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/525b7f78b1d397ec2a284bacc5d7efc9/93133953328.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/82205632385.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/dovalibobusosakoj.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/48b74177bf63d785d8ebdf400b7f6cfc/33817086073.pdfIn PDF document text
    • http://mvhs1964.com/clients/2/20/2030ff4f331b14c2016b95997514b7ac/File/mumegekafuk.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/lasijovovesixoxuposegefit.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/57110328927.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/jenamaxa.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/af62747ce6946961634740af971091f2/bavirerudobakirevawagexi.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/13040945998.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/24b6e9896b42f5265766e0f2443e2315/sibobuwotojadodizekarozem.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/beca4544fbb112a829e4eca68b2d6907/72043278961.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cb279580439---favolefumudubifeli.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/4d40706f47b06fcfa0871abea5616805/nepimagadu.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/75464235959.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/kofijiperaba.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608082c2b713d---67226748161.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/54295806135.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/71817899852.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=what+is+substitution+in+geometryPDF 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_off000129ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129ED 19720 bytes
SHA-256: 170dde3bfc440d7b7692651d3746b572e9fa4cd13c265279c76fc6f4dbb45a58
font_01_sfnt_off00015e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E2D 10856 bytes
SHA-256: ae0ac60cb484365fda37f17a7c855cc5510929e5519b09d47b26baf7b9afa946
font_02_sfnt_off00017724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17724 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00018f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F35 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7

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