Malicious PDF — malware analysis report

Static analysis result for SHA-256 8167d19d609b98db…

MALICIOUS

PDF

83.9 KB Created: 2021-09-21 05:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7166e95379e6580e673a595e67c37d7e SHA-1: ca4b3955faa5397648c23d90a9efdbd0ff5fe17a SHA-256: 8167d19d609b98dbe4ecacb050577f76b763ddc36e8432f6ceb154b1fec434cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and link farms pointing to potentially malicious domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://drafthe.ru/uplcv?utm_term=distance+and+love+quotes PDF link annotation
    • https://granitabrasive.hu/editor_up/52823403037.pdfIn PDF document text
    • http://355353.ru/userfiles/file/pixatowovepomopofavigesi.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/babakosadepatisijek.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/c46bc88b0cb847a56dd3c584421d1c8e/36719839020.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/xilaxi.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/xuvaxagemenego.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/durilibeb.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/48760743485.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109161833164606.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/nibopopumifumewitatoruvu.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/zusovoliwaxabir.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4606ef84f---75947982252.pdfIn PDF document text
    • http://www.yt333.com/userfiles/20210911/file/1631316729.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/xokefugebuwide.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/zisowitoj.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/10214031299.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/hqdgmfsva1o0puom1gc5rltn81/wewofajob.pdfIn PDF document text
    • http://orthodoxnews.us/file/49216012892.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/f25538e6a2fcd0cf9890fc0fe437a284/33654290261.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/fovezamavopelowokulid.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/11870586180.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/jadigonakanij.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/jovivoxavomikel.pdfIn PDF document text
    • https://buyafranchise.org/files/files/vukamevalegafop.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_off0000e344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE344 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB56 18156 bytes
SHA-256: a5dcb75109324f6c0d2e2cf78995079e9b862a39b7ff8e35ef447720d81a7060
font_02_sfnt_off00012a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A44 10576 bytes
SHA-256: 68dd2d1906ddc5a18c51a9ddfbda878a86d1b12e852aea1df6a44dce5b954725

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