Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e0a6213c273aad4…

MALICIOUS

PDF

95.3 KB Created: 2021-09-20 15:34:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 61c57cd0dcd222a5926140d54c0293e0 SHA-1: 381e7c3ab14f97b02974f38f1a0223dc214ab468 SHA-256: 8e0a6213c273aad430b6849e152cd4eaa2d49ce587884cd66344672b933957e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm for phishing or malware distribution. The 'utm_term' parameter in one URL indicates a lure related to software cracks. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://queure.ru/uplcv?utm_term=adobe+photoshop+cc+2015+crack PDF link annotation
    • https://myphi.biz/nbloom/fckuploads/file/1581939902.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/60057095142.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/zelaxapokovu.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/98026190930.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/datanug.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/85281010330.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/15757791910.pdfIn PDF document text
    • https://protrialse.eu/files/files/zulatofewagexi.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/digutikinapimibiropixa.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/sitagokosemusavakejik.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/kerazeledese.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/4660760435.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/mamuv.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff5f748e8a---29915123594.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/10847440594.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392b53a8bb5---tudugadox.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/38135823364.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/lodumike.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/moner.pdfIn PDF document text
    • http://qqwandai.com/uploadfile/file/56553455986.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/63906783452.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/falodewalejafizisixiriron.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/ratopopifivazutisinowax.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/6a0ed0b9946630fb0e39b97dd44b382b/3692447098.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/53984631091.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_off00010d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9F 18636 bytes
SHA-256: 0927b3ca42245148363f21f5bb41b1a662f2ad0cb961cbe725f257673c9d8649
font_01_sfnt_off00013d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000155a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155A1 11008 bytes
SHA-256: cedbbe9cd1de4a616efa05c450e875348f865e8db43acdc2e229450516254cab