Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f613b371472bce…

MALICIOUS

PDF

77.7 KB Created: 2021-09-06 16:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f156b6cdafb851dea7bd890dca5f0dbc SHA-1: bcda102316fd2b124800cb4e0a449d44cd71964a SHA-256: 33f613b371472bcec8c80bb86428e1c04c30aab9ef41e85f3b7540b056f9a3d5
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, which in turn host further PDF files. These links likely serve as a link farm to distribute malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crysiq.ru/uplcv?utm_term=atticus+the+truth+about+magic+pdf PDF link annotation
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/21cd77ee37b4328324d2f1b14cd448c9/kerobedole.pdfIn PDF document text
    • https://gilbertems.com/videos/file/1706288717.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160763e6a0edde---rovenajotebenomodikapudat.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbdbd03cd2---sedikisipodujokanofeza.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/9mdl5vhqhj665d8komrn511gbj/xefet.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/4643485438.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/xelabaranekat.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/42591142186.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/13a7319b7fc23e19346f6b6e3fc10ba0/74113102294.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0a8178bb3---92580423199.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/16947843503.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/majewolajokuwatemixoji.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/63567019563.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16100f0d3d3c53---geripubumizulutunun.pdfIn PDF document text
    • https://ranagro.com/files/19023636381.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/scnqrp4i2dshb5eliioqg2hhg8/26435314527.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/31700520383.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/717b0fad57d0e7065f9c1fe42575a458/71983682820.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad918a18a7---rugojudas.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16096722b452fd---20594795758.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e66bd7cedf---59043057240.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/aa5bb1f4b653625963282cbaa5ea3dbe/pazafademotewupuxateme.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_off0000ca93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA93 17424 bytes
SHA-256: ac946de7961ea805ac470f217b4df28a7dab88470eb147949d1674bd5fb1774f
font_01_sfnt_off0000f77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F94 11136 bytes
SHA-256: 6ce7a47fc0a35a33cac1636c9b31f792abf6c57d40297b6aabf1d66fc5e22743

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