Malicious PDF — malware analysis report

Static analysis result for SHA-256 877cbf2712bda26b…

MALICIOUS

PDF

118.1 KB Created: 2021-06-29 05:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8df4afdc1b1f6149dafa46a415d66671 SHA-1: bb31e132d1ff0f44868a2c2faa1b37f1d32c6795 SHA-256: 877cbf2712bda26ba54066456e83c60994f2e067ff4e7d48d9a739897cbd3050
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious content. The PDF structure and numerous external links indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://lienlacanien.com/img_pages/file/62825388747.pdf In PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/6a025292cda836c7c58726bcf128b3ed/77118304974.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/93689359934.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607314786febf---tasunebawutew.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090fbe535da4---votafuximola.pdfIn PDF document text
    • http://afro-safari.com/upload/files/nibalurivilex.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/pekuxebubojozuxizupe.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/86h018e90c69usoduqrneloh0u/53583291573.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/s8dgaci8r5dptl8j5kcuokcif9/mijuketedelefugilepivu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776d93c5ad2.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2611757ee5---fotikor.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/77452451404.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/eia5vu20bgra6858s4sfk1v565/xejitoxuvekadi.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/d27541ee98ff4556c7491ffad21b2b26/noximoropaxi.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/20717470580.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/6d52804f734d18444eb389bb133e3b27/48529962537.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/pukikelevot.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/ecf0b7563ebb425f80bd42ba9da9fb31/95639922025.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/70350654280.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/gakomikun.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210516085828113.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/warosarexijudenoriwuvu.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/jhg54s7jom9gpn4an4aq9im3hm/15427655751.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbdd36857e---tanemupet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=drive+screws+with+cross+slot+headsPDF 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_off00016d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D71 10516 bytes
SHA-256: ded8bf09fa838f0b9f33c0a72ea3a6eaad9a25c9f55cc636d29646776ca75b79
font_01_sfnt_off0001859b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1859B 17568 bytes
SHA-256: a8e763cfb189ce67f8fdfa26b7db3375f3d93ad1c66f8a9fbca7811dab81e203
font_02_sfnt_off0001b314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B314 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1