Malicious PDF — malware analysis report

Static analysis result for SHA-256 8010a76481a62b0e…

MALICIOUS

PDF

86.0 KB Created: 2021-06-30 06:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d2f0cf00989acfb7e990b87b784f6ef2 SHA-1: 431ea23bb7ca01718d7f7cdbffd4116fe75f482d SHA-256: 8010a76481a62b0ec94f724ff858e465b80e729df27cfc8ead6ba1d8a6492309
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to obscure the ultimate destination. While no scripts were directly extracted, the PDF structure and link farm heuristics indicate a phishing or redirection attempt, likely leveraging embedded JavaScript for obfuscation or further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/gkh7sgse99nph10uvfn8q3840q/34319648278.pdf In PDF document text
    • https://accuratesearch.com/userfiles/file/24772407780.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/71632181560.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/97483719191.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/ce58bbd31be468d86cdd773985d6336b/jipadebavixabizewedawubir.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/tikafuxirara.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ae82df4d0---wuwofopefidamilejog.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c936e39178---rewijurono.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/08ovq0ju5adlorbm3p6ni345u2/8628228900.pdfIn PDF document text
    • http://azizolace.cz/images/file/wiboku.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/7748012af2952db73fa05432aa65e14f/xotujat.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/jiwarojitolo.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/0809710644818593a24bc5e681726e15/82513123758.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/f42b97e1b01f47ea28322870d9a44811/tovipez.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/fazatiroxelewowij.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cccf93beef---degukun.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983cb4c3c02---xilegujefofemo.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/93944336656.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/08be6cb89b3760765ad223133ccfb330/6335503933.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/ritekezonu.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838c0f7dc8f---8546453172.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/44p1c825hu19kpe3pj4hbhdmj0/56923144091.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/3238557265.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607a56d172c6e---dazepipuwewuwiw.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/q4nie0tlvfkji89dnbjfnc9d2r/32365969517.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+dark+knight+rises+game+play+storePDF link annotation
    • 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_off0000eb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001034a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034A 11008 bytes
SHA-256: 1d98dd3a5c165963392d7c941d79c4dcd5dc9656cee2974c5c39db1b8a6bc9f9
font_02_sfnt_off00011c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7E 17456 bytes
SHA-256: 9a62d78fb5344e0b6e497044a48be2a4e89ac81110d2619900d92f4d1c2e7462