Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b06ae243c1f6d56…

MALICIOUS

PDF

83.0 KB Created: 2021-09-06 07:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 320c3a5eb4c1cd4e7048ef4b9509d0e8 SHA-1: 63c4a272a346284e3c5802240b7336307c39af5b SHA-256: 7b06ae243c1f6d56caf405eddae0ae350f8e99632873a1de1f7aca83652e7f1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and numerous links suggest it functions as a link farm to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://allytemp.ru/uplcv?utm_term=mathematical+fallacies+and+paradoxes+pdf PDF link annotation
    • https://erdenet.mn/userfiles/file/18620715176.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/822488ce515b4cfb88e8b89d841ebc08/pojunene.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/ba72e988614e4a9ec595ad2f6b073af0/nufukalatebimusufugikej.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/da20fed24b28993db68028a10e9c2ac8/jukenomamilaluzewa.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/gemafasevu.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/wixiramemamavoxewedewised.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/67108945022.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/modikibid.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a184489a2b7---50277730772.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/todatejeduzuvusit.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/otv993576hm3pcrkariije9aq6/84948056900.pdfIn PDF document text
    • http://www.toptehnik.si/images/putikefipu.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/35529184946.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/vifopufases.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e719b1ca8e---55437531225.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/h6pvdubdrjpljat9ge2p60rhmb/dutedufefi.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/602rcvsmurnt3lufne9u6330i4/55775043320.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/jadiluwosa.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/zawawilebuwuxolatibare.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774e00e7c0a---7490434385.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210703011536.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607994a069567---46829221886.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/gazim.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/658648cb5a0c27b1a76feadf2c476599/45400680585.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_off0000de96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE96 10980 bytes
SHA-256: ceb835a273319b1dbbc4b5474a8eba60c55f6a53fb30a5fd0181a8024b43ca5b
font_01_sfnt_off0000f7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF9 17804 bytes
SHA-256: 42912f2d2b11e72073e911046372291c7baee62b7d681a9a32d17db411cdb71a

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