Malicious PDF — malware analysis report

Static analysis result for SHA-256 9762b91cfd3665ba…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 23:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 57660f2cdc6a7856ee4b018563a33e40 SHA-1: f8145bc157c619f24726dce56021aa93a434dee0 SHA-256: 9762b91cfd3665ba586aad90c331a67c48d3d060f9c94104f86af10d35162d27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to trick users into downloading a malicious file, masquerading as a legitimate application. The presence of multiple compromised CMS upload links and disposable hosting indicates a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit PDF vulnerabilities or deliver a payload via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://valgott.com/images/userfiles/file/gipefakewubasu.pdf In PDF document text
    • https://galaxy-training.com/userfiles/file/73590171111.pdfIn PDF document text
    • https://majubesar.com/contents/files/ranijekodeduduvoj.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/26772376747.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f970c9cea4---banagipegiropoze.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210915_8027E8200A875B69.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/f84bec01006f503abb01c151f8113895/riredenukigigu.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/67087336838.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/zumotowizavitemepob.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/51478139741.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/9269691816.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/88b6d27bd4b5c8a9054e437441109607/62846095676.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1d5d401b2---ganisakejer.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/56286093383.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/felelapomifo.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/88001580643.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7c4655878---nezozajinezufafi.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/54654666825.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/13154599109.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/mutosaraxekaja.pdfIn PDF document text
    • http://klenderbio.com/upload/files/39636724143.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210915_24124524F38DE403.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/51863483143.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/90414359139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=download+messenger+lite+apk+for+freePDF 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_off0000d9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D8 17900 bytes
SHA-256: 1dc8c4e3cfc139763245f977abb8946c74603339ef8f90835fac747dff74dfdf
font_02_sfnt_off00012056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12056 11020 bytes
SHA-256: fcd885e2b3aa7f1b54c0f559e3d1e4f91aa05d08fac910f21a12e1aed88df18c

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