Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9273bb280672cdb…

MALICIOUS

PDF

80.9 KB Created: 2021-10-06 13:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9c29815eb70e63b6a9be2cb81ed3809f SHA-1: 0078c3c7d005038f505baf0350be32d41b4c2dc8 SHA-256: b9273bb280672cdb91ef650e5923cdfc0ab42af6450f7af3fc9e9e2459c46e19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://cructi.ru/uplcv?utm_term=baby+head+up+position PDF link annotation
    • https://hophamthaibinh.com/upload/files/jafenunaf.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/79699294183.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/towesodopo.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/nirere.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/13212124209.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161574b748bffc---naxab.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/41564594846.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/84929460152.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/foxonowevoxenazewavumixu.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/8440704714d69ee643e3ae051fa30772/58151887765.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/eb64447834126fe8fbb380974afe437c/98238429302.pdfIn PDF document text
    • https://songhongresort.com/img/files/firovodojuwegabut.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/zotarowejovuj.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/nezizekudedoxuvubafijoli.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16142e46c434b1---19015213347.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/bivebeniriv.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/43778210982.pdfIn PDF document text
    • https://cian.hr/userfiles/file/11303953326.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/70343484815.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/161597526471ef---19159101089.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161455ee13a0c3---74452318177.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/48173396921.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_off0000d5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFB 10752 bytes
SHA-256: fcafc58cecb6f9d9c3d74db067737ce6f6f66efc752d868135f3e25a60ff08de
font_02_sfnt_off00010679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10679 18664 bytes
SHA-256: 265bbeef63d99c03d670ebb031446de3eb03f98074492332366c9ef39299d1a7

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