Malicious PDF — malware analysis report

Static analysis result for SHA-256 7667512d481bcbd0…

MALICIOUS

PDF

81.9 KB Created: 2021-08-08 20:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b2cb6c8611e4d4525e5cac64749d984b SHA-1: a35c2116339bc12af473e18e0cb39c082033e1ea SHA-256: 7667512d481bcbd01be3270c51e2d8056e6aedb2bc10ed903c4793883f11c1a8
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised websites and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement with potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pixomot.ru/uplcv?utm_term=important+concepts+in+inorganic+chemistry PDF link annotation
    • https://readandenjoy.ae/userfiles/files/bilotofajo.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a14731c23e3---manubogewunu.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cc4c82116---wugagegefose.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/donimekananugamopu.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/bemapevep.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae037e56cd3---2689932341.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/4f3a83366cc39d680db72491206ee132/43188413672.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/95785575925.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c579c8dc5---55092490682.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/b1a60c956e0b6b63ef6804a3965b1c8d/jubofamudadawobe.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/vulowagewawufu.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/2dccff9b6e022575a637a2f619869a39/tigexugurusozu.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/nuraxipamopetabusurokud.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/26817721320.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/bepixilome.pdfIn PDF document text
    • https://wecareprogram.org/images/file/74836120018.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/bobafirixisezij.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/fafirogelowixoramu.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/1fae2b72f7ff84d07e59864ca731846c/pudetiwoti.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/bobajowotefugejif.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/25799997184.pdfIn PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/pabelebenaxoxed.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_off0000df70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF70 10840 bytes
SHA-256: 5e7abe9f19f5c9abeda3465ac1526b361340e39f8fefc9832bfbc5a59d8beb3a
font_01_sfnt_off0000f848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF848 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001105a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105A 16000 bytes
SHA-256: 86152697b310055430f93927e79baf616940f813141fd38b00729f2efc7e48ec

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