Malicious PDF — malware analysis report

Static analysis result for SHA-256 d929482153495f33…

MALICIOUS

PDF

94.3 KB Created: 2021-07-07 07:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e636b34cebcc4d49b1688a5283e3e38e SHA-1: c26201209c4dd7e4a8577e82d7fb480d174fdb1c SHA-256: d929482153495f33b11b6122082c2e6cedca38acd4d72a81b3ff4ef7a2f7eccb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of 'utm_term=outlook+shared+calendar+permissions' in one URL strongly indicates a phishing lure related to calendar access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://infrive.ru/uplcv?utm_term=outlook+shared+calendar+permissions PDF link annotation
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a782ba7d9---tuvipe.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/kobedijetogaramizo.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/bitinoriwabitirikokuz.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/sekegobujob.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/70357472768.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/46694044310.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/mikufazisudurosojawuz.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/buketoribajuku.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ccb70a529d90e807f2e765e9217362ad/fumolukejuwaluwalowime.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/38798752099.pdfIn PDF document text
    • http://mousike.it/img_ins/files/61594004181.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/jagajovupadikamoselak.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929c6ec5bd3---dilotajumerugifosanu.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160adb9fd1bf54---58721137418.pdfIn PDF document text
    • https://bloomeng.com/uploads/22495100135.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f229c4834b---10570555841.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/1loqn0u4kn90ap3526a02jlb66/juxuzekopokukapigitetobof.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbb5101651---gukelo.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1508c7602---83273258096.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/5e85882314a2d7c1d3fe45328a70924b/ponipatobalozirolo.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/katorimikezase.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/gokuwurenigakuvo.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609079497a0b5---napukizejegijumevuwa.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f42b17ff8e---62375362124.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
font_00_sfnt_off0000f773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF773 10996 bytes
SHA-256: 7d3e3f8d78aee22b0b13edd33226d826fb73754c789d438dd54b30b04a1f3c31
font_01_sfnt_off000110d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D4 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_02_sfnt_off00012650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12650 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E62 17088 bytes
SHA-256: 5976b10dd993fdfedbb456478dfe3b67476a6f423062ef5e3e08ef406272213a

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