Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dbd9895ab6e5fd6…

MALICIOUS

PDF

94.8 KB Created: 2021-08-01 08:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aff5533594908f4dde6340f710d5e4d3 SHA-1: d876abb2699578cb5d29b3fc832d28b40e95910a SHA-256: 7dbd9895ab6e5fd6584c052c5634216a9499a0144756b12c756978c9d4da108f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be disposable link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://queure.ru/uplcv?utm_term=exercices+la+multiplication+pos%C3%A9e+cm1 PDF link annotation
    • http://urparitet.ru/admin/ckfinder/userfiles/files/jitovugulop.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/11745363874.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/xoxezorivurojevuguvawe.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/5nr97l6hrui00sunp0nbt57ijh/piwulafa.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dc997e7a2---1653500482.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/62841273432.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/r6mgm36er6vpitvds542mr6jf3/86676896167.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/361f772a7adf6950d2cc599c39c9042c/34088466793.pdfIn PDF document text
    • http://www.bandungmesin.com/file/bolerinud.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/3451b5cedc607043fce4acd3bc6dc2fc/jiminafejurotetafif.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/02ff67b31b9c98f9500d7dc5237906cf/86605104469.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/64153345136.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/20245057986.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/6536745cb62f1fe353df5d3b24069cd0/10165033457.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5ea81ad9d---74948560672.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/ebaac32f52eb2d0ce5b57fca31933e8d/bixepijegexerisejolobad.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160771d696a535---78239254704.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/5a9e3cc962331af144493d3f70cf3a82/97013143257.pdfIn PDF document text
    • https://dm288.rs/slicice/file/82158276068.pdfIn PDF document text
    • https://denimder.org/resimler/files/kigoruxoxegajejakigojo.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609445acc53b2---fotixezenusezagodure.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/jowisozivegi.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/57965434164.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/qk77bfk5tkm2huhevk9fg3brrf/48427002173.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b01d7e5b1---xotadorizilakomevubopojen.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/33282794473.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/hnmg2vs0kstvqu9vhc6ouqgedk/fijuvikedaromiduweboval.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23D 19192 bytes
SHA-256: f35d1aa120b866cf1cbc4ae6f3900e1030e84416add5f11ba5246cbab34dca8d
font_01_sfnt_off000121ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A03 10924 bytes
SHA-256: fb975a7c1e74b9d486739df60c524c419e1eb1e598575d8bb74de06aeabafaa1
font_03_sfnt_off00015314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15314 16556 bytes
SHA-256: f13ea7e8b74ccbe86e01bfe4d5efde6fa2f9fef470e4f57354e2d9ba12a588cb

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