Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc405ee68ecf9ebd…

MALICIOUS

PDF

87.9 KB Created: 2021-09-03 21:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3c53134e03cb0148ecff3f6079b78de0 SHA-1: 9b82c1f9c441508663b3c1ea0c0f611dc11a50ad SHA-256: dc405ee68ecf9ebdd99ed14b56797244ee9a96f7f22b7632dc68b890f0947961
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to various PDF files hosted on compromised websites, suggesting an attempt to distribute malicious content or redirect users. The 'SE_CALLBACK_LURE' heuristic indicates the document likely contains a phone number to trick users into calling for fake support or billing issues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://newbiesites.com/userfiles/file/wenuge.pdf In PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0bb8bf99a---zizipivewo.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/57004922954.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/kogosupevus.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/goa2e0olnksgvfvg5lgr8bsb1o/46703351851.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/pe1i3g9c6glsr3lkbc7kac42sr/28651668971.pdfIn PDF document text
    • https://85097781.com/upload/files/lududovovobinupan.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/op3benlj3rdmbagijhomuv44nn/xunuloxezumubupepulujon.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ca5b755ab5a---virogugu.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161143ece551fa---sinuxamiwaw.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/dikekumadulufuwapuk.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/1040735619.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/jubejixifemojetozuf.pdfIn PDF document text
    • http://jarosi.hu/files/file/wutidewo.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/70df45f51e63998e7c467add8ca5bf7d/30554552062.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/2334941867.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/52939e7a69b1972064c5583ecb60b4ae/bugozinalanal.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/18963505919.pdfIn PDF document text
    • http://heureka-cz.eu/files/pozexebewonibagudowuwod.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d0849e50ba8---49548533609.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/pukoz.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210808065123_383836071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=essential+elements+violin+book+1+pdf+freePDF 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_off0000ef2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10741 10992 bytes
SHA-256: 1b39005c44c8bd96792ba9abee889afc14a668103c8b82a20cb264f2609dede1
font_02_sfnt_off00012099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12099 18916 bytes
SHA-256: 55bb804593f75a28d5d2db6834de3ef205f7a22db592baf0f66f86cbb2ea068b

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