Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ec53826d51ec9e0…

MALICIOUS

PDF

90.2 KB Created: 2021-09-09 23:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1a98070837f47b46f35b43b3562edaf6 SHA-1: f13b2b4aa54e9d9eb9b34121b4f4deb420775281 SHA-256: 9ec53826d51ec9e0e7ccdea8030148c049d46eb5aeed5df4f0f5b7a8f6babaa6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting. The presence of 'utm_term' parameters in some URLs suggests a tracking or redirection mechanism, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://everestart.com/images/stories/file/47430953111.pdf In PDF document text
    • https://bellcera.60km.com/upload/files/limosav.pdfIn PDF document text
    • https://mollis.rs/files/xugetesonulozaruti.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/sibikewo.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/16308654813jns.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/wajakajugujidizana.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/bomududobajoj.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/zajarun.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/21760553348.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/bibuxumefemuvikepomejo.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/14488487561359a06c9c86.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0b6b9ec8e---11753272061.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210901093432881209x85nux0us9ji.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/tumerotepixudu.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/543752535.pdfIn PDF document text
    • https://thehouseproduction.net/file/kepevogowawofifezisov.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/gevevinokilijupujarur.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/24619770538.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/ziduv.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecab1674b7---titeb.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e78b16169---xapovo.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/ketemoratasapivixa.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613857d8e0b7a---65042520705.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/55954848225.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210908172901.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/95542981677.pdfIn PDF document text
    • https://rosycaffe.com/file/lumalimuwemijudogeninupel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=mcinabox+minecraft+apkPDF 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_off0000f5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AA 19368 bytes
SHA-256: ee83b0d2d31ad05469d209727cb66b786e26c393f16ed06ac99510096c5e361f
font_01_sfnt_off000128bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BC 10752 bytes
SHA-256: 4be05d078f773bf70eb23b77fe59214d59ccee664425c32c9d41253b929c89d9
font_02_sfnt_off00014149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14149 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1