Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c145d2bf18a88c8…

MALICIOUS

PDF

71.6 KB Created: 2021-09-24 16:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9e87ff7593539f9c3183061c964d0bd7 SHA-1: 760c1f65de01b9b63e64ad3d2ccc197712aa000b SHA-256: 3c145d2bf18a88c8c8ea82668c6c0bfec126f98098f4b2d849be9690537cbc55
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed for SEO manipulation or phishing. The 'SE_QR_LURE' heuristic indicates the document instructs users to scan a QR code, a common tactic for directing victims to malicious sites. ClamAV detection and ML classification further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://catamma.ru/uplcv?utm_term=how+to+scan+qr+code+on+redmi PDF link annotation
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/60f914d8697dd6f441b77bf7b9acd76c/62440135540.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/81196649500.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/majed.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/11490680731.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/5066865401.pdfIn PDF document text
    • https://heureka-cz.eu/files/sofafetek.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/guriguxeseratudirige.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/66767727707.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/900abed2eb40bfd5715b3634801a661f/wetamodimepuxejeliraso.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/sotuxuwubatefimexesak.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/resosagox.pdfIn PDF document text
    • https://tavio.ru/files/file/60202341651.pdfIn PDF document text
    • http://innersolutions-uk.com/file/busaxewel.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bfc624b2d---25971501899.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/digabasogekipiwumanetiwu.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/pewemedareguvuzusevof.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/48303016058.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/59891303008.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/gibesalelejatupubox.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d86370d34---54615655857.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/mewisubatuvoletunoviguke.pdfIn PDF document text
    • https://rayvoltbike.tw/geektic/files/tagelogutolududebesatomab.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/68944595930.pdfIn PDF document text
    • http://apple888.vn/luutru/files/31949357341.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/jewevomesafejivuke.pdfIn PDF document text
    • 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_off0000b516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB516 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD28 16960 bytes
SHA-256: e80900b9246e4195c6212c57b4886998743d850054365d02ca962eb5c61d159e
font_02_sfnt_off0000f84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84C 10708 bytes
SHA-256: 9d3c43edffcdf6ec0e8dab1a4c978c6c9a99f804e2710a5e5b7f0d2a73cb3e5a

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