Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91a2bdf3e0d5ad2…

MALICIOUS

PDF

85.7 KB Created: 2021-09-06 23:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 908374658d517378c9078a63ccf1f91a SHA-1: 6eba13f40c845fdd1ede1cf22806dbd6eff717e3 SHA-256: a91a2bdf3e0d5ad28958f462fde876e698f0ea1c9ae7832b930e7a2edf7541c3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which appear to be compromised WordPress installations or disposable hosting. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely provides instructions to decrypt a password-protected archive, a common tactic to evade gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://inwebjor.ru/uplcv?utm_term=comment+pivoter+un+document+pdf PDF link annotation
    • https://clumba-indoor.ru/files/files/28579330430.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e208a5972aa---32014628986.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/pebib.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091272fd3d39---dinigosuxojipejutifer.pdfIn PDF document text
    • http://gtshotel.it/images/file/72052692038.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/56471654216.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/85794633e1a5cc7fe9f343cb6ba38ebc/baxelijumijibuxudex.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985fe9885b6---xamasasugol.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611abfe140453---xevesoxudevigujidikamoboz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa636290b37---kedolijifibasifotalajal.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160afa610d6d5c---sadibabigizavager.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/59357414661.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/sutafirubasegutitikur.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/xabiwuvi.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/2021722203035.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/19728501147.pdfIn PDF document text
    • https://artenika.pl/fck/file/wimezarapudulesojizamu.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612144d6d537c---nenuwumepuj.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/mumeradova.pdfIn PDF document text
    • http://fxlcd.com/upload/file/66722090752.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/rumekopilokow.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/migofuzikaxuvixumo.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/21916543344.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/62903579743.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109022216259862.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_off0000e56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56C 20156 bytes
SHA-256: 7f09662039a92d3825565917fd89f066cd381d57b2fb9c79c50377106b292632
font_01_sfnt_off000118a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BF 10604 bytes
SHA-256: ffb77952ee57c8fed3c46aec5f0eaa4d16e1ba97844ffb4d0869808a4e9a5614

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