Malicious PDF — malware analysis report

Static analysis result for SHA-256 1632eeca79969a9e…

MALICIOUS

PDF

77.5 KB Created: 2021-09-15 15:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 560760c54808a42df86f7c36ab7fcc25 SHA-1: 1b7d779a84b5da8797bd1137fdb47375732846ee SHA-256: 1632eeca79969a9ed0ddb44ec7663d5e29bc40d5d925cf9b40c6669b609b83e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites or disposable hosting. The primary purpose appears to be directing users to external malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=five+nights+at+freddy%27s+3+download+apk PDF link annotation
    • https://bandai-k.com/userfiles/file/34987358480.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/xozobedenululedidixa.pdfIn PDF document text
    • http://ecole.ru/text/images/file/julubuzujerebuvuvimowori.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/3ec1cab533b8d079c9f695d1dc2fc723/30900106403.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161415902790dd---semajetorexukat.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/10029020877.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/84995261961.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/17732035023.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/94115260122.pdfIn PDF document text
    • http://c2r.su/uploadfiles/file/2021091010111773499.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/8955082222.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370b7c0bca0---pelikodixonuwepo.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210909_4C9C70F24087067B.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/39600284235.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/22359398170.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/fifevujigu.pdfIn PDF document text
    • http://gibisch.org/files/files/35949297339.pdfIn PDF document text
    • https://portofcrotone.com/dati/upload/file/pivalaxuwefude.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/xikebomigavisabanerituvel.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/83354588411.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/72947728708.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/96684216604.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/58441867777.pdfIn PDF document text
    • https://b2cdemo.tickets.com/content/files/sisofasefojin.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_off0000c86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86E 11316 bytes
SHA-256: 182882eb19c984920779a31aed721479d775d387fe2dfffe794688920e7e2489
font_01_sfnt_off0000e2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000faff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFF 17328 bytes
SHA-256: e2347fd89d37679a2f8d170d3871cf0d9a8e193119c87fcdcbb8b13e3d737107