Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fffa28da96c5795…

MALICIOUS

PDF

74.5 KB Created: 2021-09-02 15:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 47a55e12ccde69f7fa7d344a5940adae SHA-1: 2f2d4313213655f5ef6ba71f40b7dadfd39bdfd0 SHA-256: 3fffa28da96c57958e916fa60dc0c5dabdc6023d92f42be39656e4de77ecdc72
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://huntic.ru/uplcv?utm_term=finder+pompe+manual PDF link annotation
    • http://rjbmachinery.com/d/files/dolopiperevolekiwolusife.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/pifidekevapuvaxomif.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/41441336092.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f05fa3979c---34674819429.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/vawabowawelomovimamisi.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0b45ce434---30362034041.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/852d92181a2f5b90937a3f958b7fecb5/64306849357.pdfIn PDF document text
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/puputoxijujununiwip.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5ef61192a---kevataxonufikixev.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/38443492270.pdfIn PDF document text
    • http://podushka.by/files/files/99302430167.pdfIn PDF document text
    • https://hsse.cl/files/bufuwojozunirugabotig.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/mowinewabiv.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/soxufet.pdfIn PDF document text
    • http://scarpatti.com/files/90526900725.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/luxudo.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/gsugapt8urs7vd3ug2hpjb5lr2/kewesivozojuworumizij.pdfIn PDF document text
    • http://angeladaniel.de/uploads/files/gunemixidanozuvominar.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/67125165013.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610659311443a---86203347253.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/gojevik.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/20107616308.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021062919291017.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/jupeke.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/jekalox.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/jorizurezukezipodonowixi.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_off0000bfc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC2 17568 bytes
SHA-256: 2e1af15863e3fc5f049594cead3b5a26abf1f16ead63df231f3c9a56c8c205af
font_01_sfnt_off0000ecf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF9 10364 bytes
SHA-256: 96abb74bd52c0fddb793ab4ba1f3f4cff70c4e6cbd7f1b200a6e38fbede72fb3
font_02_sfnt_off00010433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10433 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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