Malicious PDF — malware analysis report

Static analysis result for SHA-256 357984bb2e442627…

MALICIOUS

PDF

76.4 KB Created: 2021-09-14 07:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 171f2623c2b9e956d0170934fd61cfb3 SHA-1: c19557f48df87a32c6451907972020dccf585403 SHA-256: 357984bb2e4426273dde3422d3abc220488dac404d5ab8f2f1f0b1e67ed01fad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, with one URL containing a 'utm_term' parameter suggesting phishing or tracking. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the heuristic findings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://drafthe.ru/uplcv?utm_term=majin+vegeta+manga PDF link annotation
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7c3226a5a---nizibami.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/75996962408.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/dibepun.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/35988864175.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131d9d65c631---simibepixikozefepowovetid.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/pujukufiwe.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/zerulage.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/29570735963.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/87912701223.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/zadof.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/187eecb56fde35b111871666d62ab999/45881303373.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/19793068208.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/lawasurisovagukaxonuxut.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/24706416930.pdfIn PDF document text
    • http://canvangdientu.com/images/file/16204017781.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/ranojezamub.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/radodeduxitagisatikos.pdfIn PDF document text
    • http://wamer.org/userfiles/file/vonuxixane.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/89102974274.pdfIn PDF document text
    • http://fitviewer.com/files/file/tezowupexivogokebap.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0841081c8---sumotezexepe.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/kabax.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613216111878e---kirajibirasogavi.pdfIn PDF document text
    • http://dasbluemchen.com/suvigalesinekixawa.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/20516106848.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_off0000c436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC436 19028 bytes
SHA-256: a3df5532fe545a1f31e98d4ce917d7a42f4c2d63fce826511aaf78c0bcf57699
font_01_sfnt_off0000f578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF578 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8F 10208 bytes
SHA-256: ca79ef6fe150dab7b19efc7c054b589e871291f23b8a03c1513982a75c5fab90

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