Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf42aaa052a4854d…

MALICIOUS

PDF

81.4 KB Created: 2021-09-04 14:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1d93dab37865117f5c5718339f10bdd5 SHA-1: e3a0b87e8035208b4fbed1ac45297afbd77de162 SHA-256: cf42aaa052a4854d625cf8c53f377bf45cf463336864e1cedc359b8a58d95ed0
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, specifically as a phishing or trojan delivery mechanism. It contains a large number of links pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crewmak.ru/uplcv?utm_term=compuestos+organicos+persistentes+pdf PDF link annotation
    • http://cmrivestimenti.com/userfiles/files/tifuxozikavak.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/sumerudaletolanesewajavet.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/fed91d7cef0bb47807c625f6df4c382a/96962428958.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/35534994505.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/ab7eab95165585d016585e49eac894b0/xisutukalufekavelo.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/s403iqq0a6hab95mnumlfqb42e/gilopipimu.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/d77170787fefe8392237d4ec21c6daf1/bejogamubijunoxepabida.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/sevikokategezamodeniboti.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/847940c214d290494fba0c6c5c278bd3/tolupejoteval.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/31069848859.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16088d75dc979b---8690974212.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/g3b3p93gh9vmv4tfk49vmujno3/mewagomugesakot.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16106b42a3aeea---fijiperefa.pdfIn PDF document text
    • https://digireg.dk/upload/41176186376.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/17849592203.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/tokize.pdfIn PDF document text
    • http://tecumseh1962.com/clients/85183/File/85824021140.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/13evduh4hoctjr7ncflfhd0esb/neriv.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/c839f4886b665f10b4770dfc0ea65333/wazemaroxexamanex.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/4205888200.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_off0000d725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD725 11048 bytes
SHA-256: baa3f8cdb380c5554f154ab0b74a7f6a820a340944d00da27ed6fe51651b8a1f
font_01_sfnt_off0000f0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C2 18924 bytes
SHA-256: 7d4d60a36b6c600c4250ee6176b4423126d3f315c05fccadc9d26f6a61071286

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