Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aab77bd5c1d5f32…

MALICIOUS

PDF

80.4 KB Created: 2021-09-12 16:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c307a504e8e3bc2ca2b26c3a6c05d7a6 SHA-1: f2c31f4b22edc172527ef4101ca2cfa6f40fb36d SHA-256: 2aab77bd5c1d5f32209b055336ad55e09c73d88766fa18f6c7ee7e9e58f3000d
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users through these links, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613cda75bc5f5---76087467103.pdf In PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/75321436808.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-04/images/files/lutamejitanigasa.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/60a3312f80189bd5e115599a491b4be7/15183082753.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/93309701337.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/namipitokexasolenifadagi.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/14173621146.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/58d934eadd109682583822967698a6d2/vebepowumagaxuz.pdfIn PDF document text
    • https://nsaimmigration.com/userfiles/file/18849912223.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/dujusujejetaredajeni.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///39671128527.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134444e6f8fe---bufuzidopinurino.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323d8f67a3c---punetuzulevuleroralikuza.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137749e64328---lawanatezum.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/48322509158.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/39991152036.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d466ba6efd---keberibelininedefezefuve.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/jinuranagujurunulafejipiz.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130b04879102---36266144434.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/80230453077.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/zepopubirawe.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138645c712ab---98418139225.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/33815131713.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=media+creation+tool+windows+10+pro+64+bit+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC209 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA16 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_02_sfnt_off0000e2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A1 11144 bytes
SHA-256: 767973084b45617d74f61f09c040d6b8d7342c56eb66a539ac77738e0822f132
font_03_sfnt_off0000fcad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAD 21108 bytes
SHA-256: 963f64c9350b266a5500290caf12e87633380a1c550dc3fdf56ab67455426045

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