Malicious PDF — malware analysis report

Static analysis result for SHA-256 5256759507cc1b71…

MALICIOUS

PDF

95.2 KB Created: 2021-08-15 06:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1f9b0c09ba6423c8515c68114c86702b SHA-1: c3331cf1c55681f03e7c8be573b78eaab5e6614b SHA-256: 5256759507cc1b717f2a99821318f0d6923a60c5e77b2c5ac086a7d5a85fab66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest the document is designed to redirect users to malicious content, likely leveraging embedded JavaScript for obfuscation or execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://drafthe.ru/uplcv?utm_term=9+s%C4%B1n%C4%B1f+biyoloji+h%C3%BCcre+konu+anlat%C4%B1m%C4%B1+2019+pdf PDF link annotation
    • http://moffatcountyhighschool65.com/clients/878592/File/pesob.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/42594614088.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04be6586be---19265116399.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c15c39aa6a3---36605656501.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/leruvekute.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/20423540253.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088902da8a0a---vanunobijorijezutado.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/92037679865.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/govirazelu.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/66696803739.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/53614527234.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/14675011915.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160861225235a4---poxulotiwumurikexowibub.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/genixatefilewowevotadawil.pdfIn PDF document text
    • http://mckeoughfamilyreunion2021.com/clients/b/ba/baf9e6b347377fae0abe5a87436fc4cf/File/kuwuwubixid.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/827ea5a8fb5f5b632871cfffb3a21314/90443826854.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/99755824519.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/gutanad.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/1500f1e84f5e56eb12eb8fb4398bfef5/nikuwefezebit.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/vosad.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/59807346592.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/78639168319.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/dfd407b52a510d7faeff416ee5e2fb91/46122878722.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/xusetolorifotiwidunaru.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_off00010974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10974 12064 bytes
SHA-256: d58139c5f1142adda8f5664057055ea457ec967ee83dcff93fbf52bc82081890
font_01_sfnt_off000125d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D7 18920 bytes
SHA-256: 56930037ebf8225618bcc902def41b0a2a98cecfcaf23b50b572230ee44564f4
font_02_sfnt_off00015387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15387 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1