Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb04b7171b69f3aa…

MALICIOUS

PDF

82.6 KB Created: 2021-09-10 23:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e85d90d603c85f497fbc70e9592ea163 SHA-1: d1a72ee9289f6b3d2973059f6cf593f882cf5cb3 SHA-256: fb04b7171b69f3aab8a9cb95243e7b267317463b85883fc4f3960815ec0d9c7f
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, including one hosted on a compromised WordPress upload directory, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern. ClamAV detection and ML classification confirm the malicious nature of the PDF, likely serving as a downloader or redirector for further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cecprint.com/images/file/59424116963.pdf
    • http://cabinet-blin.fr/ressource/site-image/files/zetetalinaxadajowilenej.pdf
    • http://arcstema.com/userfiles/files/kibesapezuvunatenenapit.pdf
    • http://tuning-zone.eu/userfiles/file/bezojagodologatoruwor.pdf
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/busurusipapagugijam.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3d158bf8f---wonakapanovufizadip.pdf
    • https://mkontakt.com/dat/file/4118991190.pdf
    • http://perchegouet.com/ckfinder/userfiles/files/20783039946.pdf
    • https://gloriamus.org/Uploads/userfiles/files/xamilagobevekemugikuges.pdf
    • http://elesi.eu/fichiers/files/kuzosare.pdf
    • http://blevy.com/ckfinder/userfiles/files/jizureniwodela.pdf
    • https://mimpi1pusat.com/contents/files/21401342654.pdf
    • http://campingwithconvenience.com/files/files/nubugux.pdf
    • http://fjzy18.com/image/uload/files/dogufivedivusonofotomigu.pdf
    • http://curry-box-deluxe.de/userfiles/file/tinuw.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16137bf468ea88---68380219082.pdf
    • https://remini.hu/userfiles/file/papozakepoxifamelozil.pdf
    • http://belloverde.net/emailer/file/87179637623.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613861df1b7b6---jamukovilosamuwa.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d3a6e4f08---54170129868.pdf
    • https://travelone.ae/userfiles/files/pobivobupapawasazaje.pdf
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/wowukoru.pdf
    • http://marymo.ru/uploads/files/93726309781.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=instal+os+android+di+hp
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deb3.bin
555c5eef414ebd8a1f5cda91fd687ae40cc0846c370cb0f1ac16a7bb3136698e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB3 18188 bytes
font_01_sfnt_off00010da7.bin
67a743d8bfed0316a4f9cd8ed3a1b0af32f32b90c3fb94075d06ddf94051569a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA7 10308 bytes
font_02_sfnt_off000124c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x124C3 16792 bytes