Malicious PDF — malware analysis report

Static analysis result for SHA-256 e18d2eb9783c924e…

MALICIOUS

PDF

76.2 KB Created: 2021-09-11 18:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b046eac28612b01f4d92c527486db24e SHA-1: fda602f95ffc57903c4a22f60124b1293513d768 SHA-256: e18d2eb9783c924ef7198781fc37a0c8c8fb2e8367882f10c7ef32e6e9ba0aaa
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The embedded URLs and the nature of the heuristics suggest the document's primary purpose is to redirect users to external malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=framaroot+android+10 PDF link annotation
    • http://yuanjen.com/ckfinder/userfiles/files/91704536289.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/zubegusubolefuwo.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/96418564590.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021090316282273499.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/digoniwow.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386b1fd658e---50150719619.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5ce66ff2a---79800905647.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/joleralomopowevixumexav.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/posafopuvunupobukadox.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/66952196787.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/32030629623.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/kituragubokun.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/pibotosusebabofeval.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/sunikiw.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/27256096670.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/58049653067.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/nazipiroketususezila.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/22945573655.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/6lgk0dumgn1k0hb54h6fn6i220/tavuzuxa.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/56043051130.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/tirugamuzaforeroraxirena.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/mavojegak.pdfIn PDF document text
    • http://chemicalengineers.ie/images/35825747431.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/hvbp3snmgabo1uafmh52es020m/69423345316.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/wozuleduwubarirarujog.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_off0000c094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC094 10212 bytes
SHA-256: 2343d6bbbada8152a6df5c6891aecc396a207aed8c191d2b79cf93cefeccfe05
font_01_sfnt_off0000d76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76B 19664 bytes
SHA-256: b1aef7938c171d592ea7cbd8f146da6f334bb5a5ea72b2a0e043a618f7c0b734
font_02_sfnt_off00010aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1