Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb41d31a15a13bc…

MALICIOUS

PDF

81.4 KB Created: 2021-09-05 09:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 535d890ceb799df325bde4d4c1107547 SHA-1: 7b836c35ce6eca486d1ba0346a9caaf340785950 SHA-256: bcb41d31a15a13bc9c037df64744dfe4e121898b43b4703b1df4fd9191e816fa
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a callback phishing or tech support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous links to potentially compromised or disposable hosting sites, suggesting an attempt to distribute malicious content or redirect users. The ML classifier and ClamAV detection further support its malicious nature, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the document's structure and URL patterns point towards a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wabasnb.com/files/fckeditor/file/213640161960a76b10efd4b.pdf In PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/lusejefezexomapajoxusidiw.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/14e2dc7552a6c09a8551ab4cbf456f1b/nezekoropak.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/kokonederedegatifagulo.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/kewamebusuduwuj.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/nalidadoniwusidan.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/55d289e366841c23eceb9cbae741ba19/32442150187.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210610_111018.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/solubuvuwexunulugurizowuf.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c805ab28ca---palorim.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/52211406572.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/vipovelamezazizafu.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161345d9b4d5b1---80718896710.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/95428130533.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/72349463388.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/vuzovopowisiwe.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127a0a77691d---ruxexazakutuvolalikobowis.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/kuxofupimapuselobopirali.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd35c530f9---badilirifewow.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/jazawikezewa.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/93674039606.pdfIn PDF document text
    • http://cedarvalekansas.com/clients/875954/File/tazejegapusisaxexukawawi.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/95736313357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=yamaha+c4+preamp+service+manualPDF 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_off0000daa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B5 17136 bytes
SHA-256: cce3d765a5f741324595d369ad6c5344e7f581fafb94011bb4426a3042a13b7a
font_02_sfnt_off00011f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F86 10648 bytes
SHA-256: 4e9ab2833bd163a5a2d18fb1b54385282da164d795d746e22e6d9256409054a9

Open this report in the interactive analyzer, or submit your own file for analysis.