Malicious PDF — malware analysis report

Static analysis result for SHA-256 173a03f7052d297f…

MALICIOUS

PDF

83.1 KB Created: 2021-09-17 21:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cbfb9cc0224c5060a3208de6a2286103 SHA-1: 44b460968e48b1c011c985b5c07a0d6d9a19f63f SHA-256: 173a03f7052d297f022170c4206a3e7072ac42f4f294753aaf49211be95f74dd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the heuristic firings and URL analysis point to a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://autoachtercamper.nl/userfiles/file/92012878231.pdf In PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/73550945902.pdfIn PDF document text
    • https://profesa.net/userFilesfile/xiviniwomomubovewas.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/veguvidosorugogilafudula.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/62772602158.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/52048501626.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/85363167958.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/zowevuzatis.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/9345a6deeb26410ae241ec1d04df55a9/bumodugikurobuwiv.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/doxuderutetejaxatadu.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161389ca4db784---wovekuzesorafusokela.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210913_111358.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/e8539b4d308d0652ea1bfc6e1bd4035c/38589510122.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137363788dcc---bofulavawimevosaru.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/22985524154.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/27043729173.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/xusolipopexavefofu.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/mokepefugiwiloragirejur.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/28643102630.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/54029197257.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/fepagopifogif.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/muxufewow.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/58462698857.pdfIn PDF document text
    • http://pasted-radio.de/web/files/40628932620.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/62059420183.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/kafuvun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=english+idioms+pdfPDF 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_off0000e1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E6 17556 bytes
SHA-256: 71ef3559dc50fa5b4ee46377c22324dd452e4856f240033c2acf7dd8b2ba7c35
font_02_sfnt_off00012787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12787 10436 bytes
SHA-256: 0e799775a6c79c2c5e28d86dea5fe7eaa4700a390f631ce54af14bf2b50bfc00

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