Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d0079473d528bf3…

MALICIOUS

PDF

83.2 KB Created: 2021-09-13 21:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cddd4ea94644382df9505ae5ff7b110a SHA-1: b096d95ea062c9a0ab91cd8350a7bda7d69d0fcd SHA-256: 1d0079473d528bf352c08e8e5fd3a8d1b20034c18fd07f0c13e3509d95e81471
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://geojeoceanhotel.com/userfiles/file/20210912175242.pdf In PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c03b23a586---joloravilaxonikimape.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/36772402016.pdfIn PDF document text
    • http://xycrusher.com/d/files/panopudosutujomivakawa.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/nofufikizajotasal.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/koxikoketirivezobetepe.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/31490510394.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/22825882578.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/lolejuzunafulilopujumujam.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385cd81e92e---zurite.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/viwejotu.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/69692882764.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/23478930576.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/28331348725.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/mebasilefoliwutozuva.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/81811598183.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/fesot.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/17449485137.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/20441518787.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/60771042226.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/wakewazipirisibelejabuv.pdfIn PDF document text
    • https://servauto.fr/img/user/file/48330582653.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/49719323276.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318486ec0cc---vufaxuxivanuwugazupapi.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/zanudaxewuvoxibawajitog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=osmos+hd+apk+fullPDF 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_off0000e1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B3 17428 bytes
SHA-256: d0115db77a5f974d4430bcd5cfb7f8a25fb497bea8dc7822c1ccad621de8caa4
font_01_sfnt_off00010e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12634 10456 bytes
SHA-256: ae6d61e2289c6c19a7a1168131bf9e775deeedc296d980a35b160873973c7fd2

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