Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bedacb5133144e5…

MALICIOUS

PDF

75.0 KB Created: 2021-09-21 10:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fb7b6acdd49a4f4918caaa55ee033a87 SHA-1: 3351f8df3b04b034907f232bd1db7d659847d373 SHA-256: 9bedacb5133144e5a0a81461308633b56ec1e73e3791360134cac66ce2877436
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 URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://nomylo.ru/uplcv?utm_term=gta+vice+city+stories+android+gameplay PDF link annotation
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a9b66cf05---86641652889.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/9030459193.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/sagewovibupojebodivemejal.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/79380355708.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131acb2c63eb---vulutikupew.pdfIn PDF document text
    • https://kiptep.ru/file/pitupadakobudowiz.pdfIn PDF document text
    • http://firegallery.ru/img/upload/pulolamowasig.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/59876025010.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210910_43325A704CEAAFDD.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/zegodasekoxufewivod.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/wiwajikejugavuseforo.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/sateden.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee6da18056---31338750427.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/3818488829.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/92027611600.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/revepuxafe.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/16999637991.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4a1e79f83---xetijavavufolup.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/73100094517.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/35821110227.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/pifusutogusibivomi.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090119253691.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/59158916838.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_off0000bd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD90 17600 bytes
SHA-256: 4e2b410671ee6c53bdc7ffd5f7a160ad737c56053eec4fa05064b14f68826fcc
font_01_sfnt_off0000eafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10312 11076 bytes
SHA-256: 8a5afae67b10748b6bfbaacd55db98ea9330d7195e5c0fe73cca445357849593