Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1accfbf4eb47e9…

MALICIOUS

PDF

80.9 KB Created: 2021-09-19 17:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 464ed1c21fa58c8f05938e23fc62f42c SHA-1: 884fb3826b7debc399ae7bc629995ececb3b57c3 SHA-256: da1accfbf4eb47e903b5480908805743eccae773032e65e31c6a763cc72daf83
176 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on potentially compromised or disposable domains. The document body is heavily obfuscated, but the presence of numerous embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest a tactic to drive traffic to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://nanoservice.cz/upload/file/zesaxu.pdf In PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/80600939512.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/17280262049.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/gamupabebosuwobutotigik.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/xuwakiramewisavepunifozi.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/c4076768ef19076a4ec4d9ba65c83a3a/vitumiwirevegoriv.pdfIn PDF document text
    • https://maymac.info/userfiles/file/korebaguzewijomi.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/29359543432.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613112775ec2f---90708153984.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/61385812153.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/80eaa33cb9c6d61f2cd533912531e7ac/22568354319.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/valoruverute.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/60955366069.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/zukarudajafolilolizoze.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401e4e5a362---54582171134.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/tibogakusebe.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412adf8f62f---36391967129.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/53452112923.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/mofomobug.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/zanopobewezapuxozosemo.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/4957611362.pdfIn PDF document text
    • https://mollis.rs/files/37815119930.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/49122850698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+scan+qr+code+that+is+on+your+iphonePDF 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_off0000d601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD601 11000 bytes
SHA-256: d872633bddac9be07ee567b3032c0471c4738f9e0d9e85d39d12961adbb7211a
font_01_sfnt_off0000ef5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5A 18064 bytes
SHA-256: ed2b31eaa8be1086aef11325e21fe1790f2826a6983f6281496a419f2e0ab56e
font_02_sfnt_off00011e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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