Malicious PDF — malware analysis report

Static analysis result for SHA-256 f315f17f8ead905f…

MALICIOUS

PDF

73.6 KB Created: 2021-09-02 15:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2d04fc2670c0c7d7fb9f40d8c6494f62 SHA-1: 5eeb6b54e6788b1fe99c0bb87d96c2e66b41f537 SHA-256: f315f17f8ead905ff223f6fb2e287f201f9a32605527414d11dda7becdc3d7d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV also flagged this file as malicious. The primary function appears to be redirecting users to potentially harmful content, consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1510a914ea---zabak.pdf In PDF document text
    • https://bamfieldrental.com/userfiles/file/10975298840.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffd95d857a4---76200611113.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/xaserigako.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/86146264383.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcbc1bcd2b---bozudenuguboto.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/0c6a8018c09935e2aec860ec98d758db/4586516639.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/77572573458.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/219d71dcf5b201973c29d40dd3802578/12448516777.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/0e9edebfd4f13386dbba3c7569a99375/gewiwejolowunixafaja.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160835892c4309---zorowojedibebefajiguru.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/buser.pdfIn PDF document text
    • http://scmsalliance.com/clients/864514/File/gafoti.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/jopinesedidonuzun.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/54908648346.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021071410531422.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b9ea9a7b5---gevaloxozinekedek.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/dolalorojajose.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/58239998566.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/47701748891.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/28202185781.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/gudetopiduvidemovazozeju.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/8216e87b55121d82f4013421e1b6e850/vipedavopa.pdfIn PDF document text
    • https://ms02bet.com/contents//files/vukuve.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/gimeziwadezapoxivulelim.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1176d43e---76490326044.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/betesumamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=advanced+thermodynamics+for+engineers+pdf+free+downloadPDF 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_off0000bbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAF 11316 bytes
SHA-256: b8ada1349327d638fb162380f684e0f03551ecd55e366fd193208c4ee3f73d59
font_01_sfnt_off0000d5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FD 16424 bytes
SHA-256: f0dd04e88d4385682adeca4e1d22102fd235880410504830e013a24dfb466482
font_02_sfnt_off0001002d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1