Malicious PDF — malware analysis report

Static analysis result for SHA-256 478110f7d640ad25…

MALICIOUS

PDF

89.5 KB Created: 2021-06-28 17:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 83630b16e50ae457618d3734174cf365 SHA-1: b2f122d40dd9a7092493bab910cd8fa8f3c0147c SHA-256: 478110f7d640ad25bb5801c52f53f0aad602dfb0deb26a9b04e4c54b3bbd3ab4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains external URIs and links to compromised CMS upload storage, suggesting it's designed to redirect users to potentially malicious content. No scripts were extracted, but the presence of numerous external links points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://pistant.ru/uplcv?utm_term=the+recipe+for+goulash PDF link annotation
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b64b6290b80---69431501744.pdfIn PDF document text
    • https://tcremich.lu/files/files/28557356398.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/gopukaxe.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/o08tpp8i2o9et8hs986gkpcps9/wufebexolisabe.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c3f9cc9ab---rodazirilutofa.pdfIn PDF document text
    • http://tuhs1970.com/clients/a/ac/acc339db084e87cdfae31a76a6c96f1c/File/28309717994.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/xipodufixa.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/blqmj1755mm285bn5hg4ln1f00/fusutive.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a54fa6b4dc3---mefidugakapiwagebef.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d4773c302---30432525313.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/rtcec8fk3ihucb2v52vack7nqj/sepal.pdfIn PDF document text
    • http://jp-photo.cz/soubory/files/wolagumijixutef.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d16522359---99190685125.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/ac188dfb34aab750c10cfa1a26121c29/87273986020.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210526071451778.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160791865636ab---76394342821.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/75913657039.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfd852a4fe---kinodiwijelonulemefev.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/49387005731.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/34790192611.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/teborobigurumamagexonu.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/2qd679c0qj84m7tmk9s3dcgl7s/12418056593.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
stream_004_off00012208.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12208 18832 bytes
SHA-256: a714eff04b6ea11052a5c4f5544f4993a1af6033322dd693f7e154a7d6f66730
font_00_sfnt_off0000dd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A6 16948 bytes
SHA-256: 81dc449608fcbb96c471d07b793fa5870ec6461513f2971d03bd388d6cfb51a1
font_03_sfnt_off00014036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14036 10620 bytes
SHA-256: 1c15a5c366aa41de97fbd294439be0bae648e6f7907551451cfdc0dcff7f1df7

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