Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f114c13ed029c53…

MALICIOUS

PDF

71.6 KB Created: 2021-09-25 20:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 09a63324b4b01ba41c46cb43580eb555 SHA-1: 72f46924940e9b715e3766f71ae1b533e3d22cd0 SHA-256: 1f114c13ed029c5344a265550caf7f751c7a47632af032b0d2e9f55355c490e9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The 'SE_CALLBACK_LURE' heuristic suggests a potential callback phishing or tech-support scam. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • 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.
  • 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 https://laborke.ru/uplcv?utm_term=ld+player+64+bit+android PDF link annotation
    • http://mfcpavpos.ru/file/10708450055.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/64566429727.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/ninidafevagimetumeze.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090211563473499.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/81d5a232a7f3f2ed138bc7010724e9b0/32424285752.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614bf9deacea7---gujojowevugej.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/80417513900.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/42881616613.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/gemakajasam.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/b43767191778944c2a623655bc1d289e/31628038214.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109060554475241.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/21093792137.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614796729feba---vabogeki.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/79698136798.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/timoxuwe.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021091819131373499.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/23428642877.pdfIn PDF document text
    • http://orenprom.com/img/account/file/10690347045.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/70968236107.pdfIn PDF document text
    • https://deepex.hu/hirek/files/mejisusuwegu.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/pekawowenadutupoxedilaka.pdfIn PDF document text
    • http://greenbrier101.com/userimages/bejetasibipojifosafi.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130e635e211a---94604612000.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/jefoxawoxexipubu.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_off0000b1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A0 17724 bytes
SHA-256: 0516098a45273594026aeb57d140c9e768961062c8ac68ed7664b56d40291d32
font_01_sfnt_off0000dee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F8 10672 bytes
SHA-256: 1d60fc1f7096f3c76a8e60e2184c354aa7e1ec921818272c79737973d360513c

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