Malicious PDF — malware analysis report

Static analysis result for SHA-256 983de37a7b6ce7c4…

MALICIOUS

PDF

84.6 KB Created: 2021-09-01 17:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d5a63ef2126e6bd5748479007d1b6b8 SHA-1: cbda1cd5e0ff558e0bbb031d15e3a2945fab5b97 SHA-256: 983de37a7b6ce7c4510fc86ea297d05dbfcff026fdb63f287777f6f973610c26
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. Heuristics indicate the document functions as a link farm, containing numerous external URIs pointing to potentially compromised websites or disposable hosting. The primary URL identified is https://infrive.ru/uplcv?utm_term=google+play+services+apk+for+firestick, suggesting a lure related to software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=google+play+services+apk+for+firestick
    • http://csaladiegyteruautok.hu/userfiles/files/39524543672.pdf
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/gegejifejogubaruso.pdf
    • http://immodraft.de/images/architekten_agentur_images_/file/dutelopixugal.pdf
    • http://vitanova-cattery.com/upload/file/parunotesakelufa.pdf
    • http://www.grifin.sk/files/2466145224.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e3bc4d26a---bubifatirajikisifad.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160941e07382f1---67554453868.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/2f7dd04279fdb3ebb0f8c734d8c934a1/16737073359.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160985acecd8e6---lexadivevofa.pdf
    • http://geologicatoscana.eu/userfiles/files/17933026980.pdf
    • http://akekaluck.com/ckfinder/userfiles/files/83814853490.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/2i6onut8mqp2a5eqpfgdon3vba/95165980448.pdf
    • http://www.hermosabeachbungalows.com/userfiles/files/49986277116.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/r2fdltgnauprcis0q1qe7sadc0/63239349750.pdf
    • https://balaji-technology.com/userfiles/file/mifawoz.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/2co3ld29417hnj0c9v64l0fkff/dojasebepifaf.pdf
    • http://07-3739589.com/CKEdit/upload/files/vanakokuxuxofijedilavonuf.pdf
    • http://lhsclassof1971.com/clients/74120/File/56978275730.pdf
    • http://short-story.ru/upload/file/43670860328.pdf
    • http://broadmoor79.com/clients/864886/File/wizafofotabetupurab.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adfe7960b9a---bisesokulagaxelapese.pdf
    • https://teamcode.net/upload/files/ribofezurafalijileruropi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e59b.bin
dce4f2ad46bf32bf1e15329c0578422de219033df66d5f070649c5f379cdda09
pdf-font-stream PDF embedded font (sfnt) at offset 0xE59B 17148 bytes
font_01_sfnt_off00011286.bin
b93d254b4e374df28cc1ce6e86d0a56d3debb11f51a20af09411a66453fc5cd0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11286 10864 bytes
font_02_sfnt_off00012be4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE4 16792 bytes