Malicious PDF — malware analysis report

Static analysis result for SHA-256 639f73918acfbdf6…

MALICIOUS

PDF

75.1 KB Created: 2021-07-03 04:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8e4fe7b609641467e8b3db76789e8f02 SHA-1: d28a56545c88fed6162b0956c168eebaa4b403c4 SHA-256: 639f73918acfbdf6d329e20165641b464486f3492b7047b2e370ae2b719994e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads, likely serving as a distribution point for further malicious content. The presence of multiple PDF files hosted on these compromised sites suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/854f46a0bfcaec7a49d26566beb49cdf/29852099172.pdf In PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/5fee39cfb9951f29b15ef6caedcc2b5e/60407755305.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776c98bea66---75090620096.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609852946b5aa---golar.pdfIn PDF document text
    • http://grimastone.ru/files/5509664973.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/fiwopumirovenurepagijoma.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609595e736fe2---21743681819.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/22996707688.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/vezesu.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/9068347115.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/pukubejinugufogidirapub.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/07f9b720dcf32fee866a53e9a834b39a/14454807888.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/belogokov.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607a895f84f69---56238730751.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/turadapajalopibisar.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/97ad9cea58398b1d7f316e0f41b33b87/49296702608.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609768133807d---lominowojupadunuru.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/tozut.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a31e015fc4b---91786742527.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a1df7c428---jategefawodavotewojugu.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e87430306---vejupotitepidusifufuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=consolidated+fiber+share+pricePDF 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_off0000c1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A6 16492 bytes
SHA-256: a6f543d34df4bff1f0de82e2198a01cf25e9834502b5244951c1192598d306bf
font_01_sfnt_off0000ec92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A9 10888 bytes
SHA-256: d198a760cad9797da5b18190d42015d1b58291ab299d0b5029c739daf4abad9e

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