Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1059abb06ccf8ab…

MALICIOUS

PDF

81.1 KB Created: 2021-06-30 07:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af1d6e0cca100276a5cc35dcd7bacd08 SHA-1: 4069fec4284158d78f0712d00dd207eb63ca02bd SHA-256: f1059abb06ccf8ab9561e8456cf19e226276f3c98397428334d93e28a043c696
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and is identified as a link farm, suggesting its primary purpose is to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous links point towards a common tactic of using documents as a lure to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://synerhu.ru/uplcv?utm_term=fistfull+of+dollar+trilogy PDF link annotation
    • http://nessium.fr/userfiles/file/medabasur.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/6lgajuvla3uldjetvo6c0jlkvs/sawinorowepedavole.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210526160713.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33bb620188---tuxuzarubefofik.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/71b8b2148f8d9cbd389f7d518b632b99/vifiduk.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b54a728b79c---vagebewo.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/miritawokuzitivu.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e70b58695---59562078950.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cfb9ee290---difijafizarozotavonema.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/25153237704.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/77732116561.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/0921ef185a9509ae1c6a5e2bfa9b9894/mulisatubopuse.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/cb429d5706fcb519eca0fd5c1b4381a8/3877585316.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/4da91092cb0b6651aa2391e227102698/robabegegex.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/fujezasebodedupij.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23790655ed---mogefesidasid.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/b3011f8349859fa295540506cd1c776e/dumowizilaper.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/hru2vo24aq0f9idfmma66ej292/71003893099.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094958b01ad7---zafigav.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2520b0c43456598462c10c4b961cab0c/veburo.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/a26e051a350a13d61da32720fa55726c/vokapu.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098a709665dc---tikenosowowawu.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/62466929532.pdfIn PDF document text
    • https://ludbaegitim.com/calisma2/files/uploads/98374670545.pdfIn PDF document text
    • http://enidbtwcreunion.com/clients/5/52/52e94d62e82ff66504c7d921fc07bf70/File/somivobepetilene.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_off0000d8f9.bin
1d2ab78576eb505aa6653ee55d772ebf589d24b74a0afbf0b8530b8cce72a3a9
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F9 18128 bytes
font_01_sfnt_off00010712.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10712 16792 bytes
font_02_sfnt_off00011f29.bin
e2ff73aefd4045708b0896c340b0b17ababf5a5943592d5b424c278dc833d188
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F29 10484 bytes