Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d1fa157ebda9bc…

MALICIOUS

PDF

83.7 KB Created: 2021-09-15 13:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b56863d9541f1f3b4af4bfb278bcdb5b SHA-1: defa1bd8da15ce35020cfcf4b1afe50582527e26 SHA-256: c4d1fa157ebda9bcaa6494f19082e173435c402d72a08f40499c83e29d29ca45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to malicious websites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://allytemp.ru/uplcv?utm_term=trevor+noah+pdf PDF link annotation
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613488069f983---12845364079.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/492c4999330837f46c6b586340eb907e/87167715945.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/36092491332.pdfIn PDF document text
    • http://sushibelovo.ru/files/90087425468.pdfIn PDF document text
    • https://medpressa.ru/files/file/70476447805.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/zepuxiniduzubaluxomuj.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/busuden.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/fatesimananotozuzupup.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/71420252057.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/tixovexusag.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/60068269986.pdfIn PDF document text
    • https://satesayap.com/contents/files/48800704397.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/saroxemakix.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/34carnbjv437h8tk2t7anktn2m/vasemodaxaximasolazifabi.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/65091792294.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/73548220936.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613215a33744e---82152597335.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/mutuvubenuwu.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/muvutavarudotanobomewul.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/rowawowekumusitaz.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/jilokufaranufu.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/ea4a739a568a8317561ff65bd744f9e8/majoditolufofebupujiwe.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/povudovenizifugabidefe.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_off0000e155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE155 10220 bytes
SHA-256: c4f6605b806a766af9385d29ba7e18ec2597db58e0a95448677b99a886b4481a
font_01_sfnt_off0000f823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF823 19376 bytes
SHA-256: 9ed1f7f453fd402d79c4b63f5f1ae5c30025cd3979b721e5351fa19f0f498ac1
font_02_sfnt_off000129f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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