Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f1688a609346ebe…

MALICIOUS

PDF

74.1 KB Created: 2021-08-23 23:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: a3e45421df1d321df8e0751556e77a48 SHA-1: 05ab13c5aa7d8f31b60ad9e9ef63bb5ec560fee1 SHA-256: 9f1688a609346ebeb22fba269ae13318d3bf33a024c699f703791b964fd4197a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://briarcliff70.com/clients/874901/File/zugafuwagokoduwefeweti.pdf In PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/96141fd7f268cc2d93b5f57e6c325243/59544926309.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/fubixidetexos.pdfIn PDF document text
    • http://npas.ru/pic/file/gibadaf.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/ae7ffea58e40afae2e989a07186c139c/3609717525.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/nefarefikowutuwunofawi.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/jived.pdfIn PDF document text
    • https://cartolmania.it/file/51255647921.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/31040833306.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075b12dad94d---71721206845.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de3bec203c---89264104150.pdfIn PDF document text
    • http://skomi.ru/img/files/file/32807247208.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/89754843829.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/dcachiu6n1naedrmr5a2tft2t9/legusesatoxedawelena.pdfIn PDF document text
    • http://slsnn.ru/content/file/zudewonagilikezovi.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/74871414823.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/luberizoviwukawiga.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/zumagenutod.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9628545240---64829686149.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/ul382d6e3093dtfr3hph8e89e6/zowuvofopenujavikopipo.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/83147222422.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/71b25c688f40bdf1fb22632efafdf93c/tekama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=genesis+educational+services+foundation+incPDF 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_off0000be73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE73 10672 bytes
SHA-256: f2a77fba5d80aa30cc17a3e55d79f576e8d53f505661252ee48164304cefd87f
font_01_sfnt_off0000d718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD718 16504 bytes
SHA-256: 3830d082c5d6d62f637fe9ebb9e541081569718df05006c0b7bd8e2f695b521f
font_02_sfnt_off00010231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10231 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1