Malicious PDF — malware analysis report

Static analysis result for SHA-256 f178d00ac54c92d3…

MALICIOUS

PDF

88.2 KB Created: 2021-08-17 03:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b1fb8c20301ddde9c87a05bd10c3005e SHA-1: 7cd007e7f247bf5c609dfb9de15b6ff6ccd40305 SHA-256: f178d00ac54c92d36125a0a5e5c10573683c739a2258d7a7da951be2fbc02363
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, directing users to potentially malicious sites hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://cructi.ru/uplcv?utm_term=ib+physics+ia+word+limit PDF link annotation
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c667560b4e6---76768031618.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161132cf25cb15---vefurosepufusevupiweba.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/0ad9895b15006cf912b233c5839b8b50/sexovazinufirepif.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/15736547865.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/0685049260ed810c4648cd710b46a3ff/lezegawame.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021080418011173499.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1893c655f---90991173416.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/e005df7a35e16d44581dae8f691baeda/57755061593.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/pamemepedediweji.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/68273579732.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/xaromesi.pdfIn PDF document text
    • http://accountingworld.in/singhania/downloads/file/zosavedosowirugolib.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/b316e01942dcf65c404aab6b0b49505e/xumomofel.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/69099985149.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/xivapekidexozox.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/cf4f34d28bac1e0ff19e3c446a80b03d/92124074238.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/7911863258.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/datoji.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/40764420146.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/lijuvujuwadagikere.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6a0657136---88675772259.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/4875033f5e25a741aa1024965a33e58a/55572050002.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e56a7d91f---75699341440.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5b73d234a---87908340447.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/r7agpn8uut2eodgc7q1mp8fcbh/59164135484.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_off0000f3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D1 16932 bytes
SHA-256: 25008add91dcf5ba59d1add219d8ab489ee1ab922d145baa7ddbc57be0cd79a3
font_01_sfnt_off00012013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12013 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001382a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1382A 10836 bytes
SHA-256: a942e4881f3ef85071e1588761d97a4ef34d651bc077ff5fd26d868e76129ed7

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