Malicious PDF — malware analysis report

Static analysis result for SHA-256 10e642c07a6a42ce…

MALICIOUS

PDF

92.7 KB Created: 2021-09-03 07:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fee9282d4f5d3c944ad6eb588ada456b SHA-1: 99ade67cb50eed742774aff3ad441aa950154429 SHA-256: 10e642c07a6a42cef06a54076ff0d48a22bf90f66f524b8efff242c4b52f6c01
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 link farms pointing to potentially compromised websites, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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=horror+story+book+pdf+download PDF link annotation
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/5u87bth7tqgh0ioa5epg7a6m67/gunip.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/xijuresol.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdff5cae08---nosurijowoputos.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d662fc2bf3---wafevota.pdfIn PDF document text
    • http://allycatering.com/userfiles/62343262743.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/c8e68efe46d93816ae95a540895cd954/24523568194.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/83051623701.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/43095830687.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/63037357109.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6941322120---bizivalufunut.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/betgakefnqqtkjl8c4h0bbdks3/50640227184.pdfIn PDF document text
    • https://aedwea.com/upload/foto/ralidividowebanadofalug.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/74738978698.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/pefotigigipojo.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160789a6247c08---27095721698.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/10013710006.pdfIn PDF document text
    • https://drlanda.hu/user/file/fesevodefodazimupu.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/10453339812.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/o62iedb1ldkhv7qh0pa8cp9cp5/jaxesefuwelip.pdfIn PDF document text
    • https://lasanisports.com/files/jifopap.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/27733373528.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/vapimidobiluvabaketufi.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/c28bb791af20a74a350f8c7dc839eb4f/70427277935.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cefe421483---53125166941.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_off000106d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D1 17604 bytes
SHA-256: c49eb24ddacd046fabf12e4b5b2a74486734b662a951c4c3899bff9930426bfb
font_01_sfnt_off00013444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13444 10688 bytes
SHA-256: b526f0dae5091259a3cbeab93ed6a39c0b1c64811d6f934a6440bc9fae5d77db
font_02_sfnt_off00014cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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