Malicious PDF — malware analysis report

Static analysis result for SHA-256 071ff98883fca5fb…

MALICIOUS

PDF

136.4 KB Created: 2021-10-05 15:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ade76cc99652780278446d57d6911819 SHA-1: ad56105cfc312931a02b1eb353e90732cc59e977 SHA-256: 071ff98883fca5fb551f98b36c09ba3e177d08e2985672752169a4610df7d782
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

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://synerhu.ru/uplcv?utm_term=mack+strong+seahawks PDF link annotation
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/d75307b91d5015e09be2245a92b7468f/62677559463.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/87026100013.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/16001917290.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/df18a716f0e7dd979ff0769da3d95f61/83400316201.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5c3a30bf7---13390021474.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f441a3e9a7---gerowegegomoxa.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/tizamamewivowizu.pdfIn PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/47344620607.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/94447932306.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/b537b7e6ffe961e60627d21cb0aa99a6/86508646020.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/89642531588.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/45102466622.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/beponagidikebup.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133000454c8b---3566102147.pdfIn PDF document text
    • http://servmed.net/userfiles/file/vevudademosogebovepo.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/wizabetunofibezudonata.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/79271107990.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/vojuwopowo.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/zizumimab.pdfIn PDF document text
    • http://www.ezmoving.com/file/50330806918.pdfIn PDF document text
    • https://sportscientistsviews.ijmsir.com/ckfinder/userfiles/files/76505122513.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_off0001abc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABC8 10540 bytes
SHA-256: 8d8cbc54a997f1eba0aec55835be2cd4486b528db6cb186b5a01afef28000dea
font_01_sfnt_off0001c3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C3E5 21200 bytes
SHA-256: a086df4c402fd54340fd990b188b360067d0d326fe6a541ee93728221a026586
font_02_sfnt_off0001fadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FADF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1