Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e1efbb88bf988ab…

MALICIOUS

PDF

82.1 KB Created: 2021-09-12 21:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a2a0c9f97db78fe554d751d234a94075 SHA-1: 03085a5952896ec502d4d05d6d46ab3ba9eff0d9 SHA-256: 3e1efbb88bf988ab19d0bbf164fbae8eea060ed269690ce4f6c37bbb23776d00
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating it is a link farm, with several URLs pointing to compromised CMS uploads and potentially disposable hosting. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs and link farm structure are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132d7331a09d---38667155198.pdf In PDF document text
    • http://tungalag.mn/userfiles/files/81147067459.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/ac71f4984a68652a35af1bd5fd496aca/25133875495.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/pamanizazisuza.pdfIn PDF document text
    • http://gibisch.com/files/files/kukoxijereluveseki.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/2499847456.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/fedezisidedusabenimuja.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/vasajafere.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/dimuzoviw.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/gamerikozuwekini.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acae1b35ec---86508658966.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/lujef.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/585f6c87e491d2d46b13105c87b0a61d/83196948202.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/masurulikisofafesatoga.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/furofadoraxuzal.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/72893637539.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/54580716046.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/58065922493.pdfPDF link annotation
    • https://bodegoncriollo.com/userfiles/file/86758644835.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/79719186267.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/90184656195.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/xukamewexutozarobaferad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=abc+to+midi+converterPDF link annotation
    • 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_off0000dd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD58 10344 bytes
SHA-256: 3ab4debd3008f2f509b9255f86e40e1021bf06130da8b5f63c0e9ba646e00b55
font_01_sfnt_off0000f4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC1 17676 bytes
SHA-256: 3949094256ce365e568a2832e452278116f75969b301013d4ab20e49e428ba94

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