Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ebe3f3c1a9dcfac…

MALICIOUS

PDF

70.2 KB Created: 2021-09-18 17:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 4c55a4ed1575c436b258c279aefdcbe3 SHA-1: eca4c7506b746ef94e849a34fd2c657bed23ea12 SHA-256: 5ebe3f3c1a9dcfaced4400137065304a19a7a38df849a9c57c93cab01e5358df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple links, many pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://smidgel.ru/uplcv?utm_term=download+film+a+quiet+a+place+1', are likely used to lure victims into downloading malicious content disguised as a film.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=download+film+a+quiet+a+place+1 PDF link annotation
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/6t3cm53i4qakl2ipn375dfecv4/lofukomu.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/85717366351.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210910171325.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/28104808197.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/jobusovajozidagifojubog.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109132146433686.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/70282295943.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613736d022783---15400697887.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/95052649626.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/zowebulatiwovowelami.pdfIn PDF document text
    • http://rsentco.com/upload/file/42672482293.pdfIn PDF document text
    • http://trovas.com/userimages/45507276962.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/58532841671.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/pepudiwobajizuva.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/sedoke.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/53920445243.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/tolizo.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/61391759849.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/26361215969.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/o0cmq5oenlaljsqm5ib797vom7/biluludipufumifekojomol.pdfIn PDF document text
    • https://gangnampools.com/contents/files/zemanos.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/o8o02fb1qmeelk6cbjvep85pno/memorapununixejolilemoj.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/4b90c1d51be37c48d85aabf56f10938d/77578014853.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/65050560212.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_off0000b19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B4 10896 bytes
SHA-256: e5a44a257507e00ec73249ee3815e349dab78e7f028a282b46b79974373f5ff1
font_02_sfnt_off0000e2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C2 16140 bytes
SHA-256: aa728ed61efe7a96cb62023eb5e5c4a3729e129856f4ce98a717047429afb139

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