Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea9fe7ddd4893bd…

MALICIOUS

PDF

72.0 KB Created: 2021-09-22 09:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 632c58b636e7ee151422c3c64f76ff5f SHA-1: 8ca15e7746d01c9d3a28274d5fe8ee5a494476be SHA-256: aea9fe7ddd4893bdeaaf15c114bc4b61ca609245ee071a4ad1967b3990f5f333
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, designed to obscure the true destination. One prominent URL, 'https://inwebjor.ru/uplcv?utm_term=win+10+pre+activated+iso', suggests a lure for downloading software. Although no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=win+10+pre+activated+iso PDF link annotation
    • http://ordinate-ltd.com/file_media/file_image/file/59345497168.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/dijalaxepuziruwatesa.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/18570466151.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/43226991688.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/21358527871.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/vefexigesemiwasetimuj.pdfIn PDF document text
    • http://e-menu.hu/editor_up/12283950169.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-11/20210911015217553642.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/nilirozexitikim.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161493e38db172---77625904817.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/ximutevinokelo.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/64001428872.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/97e04de1720d7de0d2b2d1c2d0eef122/timosibuxi.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-16/20210916105155666653.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/devisufutanobaz.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/povowakuzavoj.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/21989507439.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/meraviketewaxuf.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/pivisez.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/dapifizegu.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/51431733754.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136387a993da---zakude.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_off0000b6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6FD 10692 bytes
SHA-256: 4d9f61b84ab023bd64befefc5ba061f03673bbcef03b6dcbb4547ea6325ba86a
font_01_sfnt_off0000cfb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB6 16764 bytes
SHA-256: d44b99c39a6856a6dc41b8519b7675c4974016b0dd2426f73882bb99b5eabcfb
font_02_sfnt_off0000fa5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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