Malicious PDF — malware analysis report

Static analysis result for SHA-256 c710368471937dc2…

MALICIOUS

PDF

116.4 KB Created: 2021-09-02 05:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: faff442e2a8fff0bb837516c270c86e6 SHA-1: d1d6e7b758fc7846385426e63bbbe1d211e2c9b0 SHA-256: c710368471937dc2249ddfdb9438c90159a95d9d290fcbc2d1726434e05a8937
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is designed to redirect users to malicious or phishing content, likely delivered as a spearphishing attachment.

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://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160fccad2898ba---kanerivofiditadonidim.pdf In PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/4d17580c7413786be87a9ab173ffe886/gulalubajukuperib.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/966170bc3831289d1ab8243928ced5b8/naxugaduwegugiwimu.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/tagofipovesavavelak.pdfIn PDF document text
    • https://isosklo.cz/uploads/39130670306.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c113890d9c7---57538842739.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/wabisuluvetivulofod.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/4974075410.pdfIn PDF document text
    • https://tuttoadomiciliocn.it/file/xivonozezif.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/36536976709.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6b269d46---galalapadixikile.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc9d5e4d36---28661938990.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/mimime.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/gnhir35el7ggpvt91jr6jom65o/91053881083.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/95038287445.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/nuxezuwiwaziwu.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/d21d94e612e7f1b08123601b813b4eec/wupexajimuxi.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/10073935384.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612395209d434---jufitonesomavuvetesev.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202107071416505796.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/51022892783.pdfIn PDF document text
    • http://wahibluedevils76.com/clients/5/55/55d7338a7abcce318bc847d7f34994f5/File/23872444172.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=difference+between+meteor+and+meteoroidsPDF 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_off00015a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A65 21052 bytes
SHA-256: c5265e26aeebc703e19731e3d4c2a1caa32651e99b6844b2367f5aeb4646cf9a
font_01_sfnt_off000192d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192D9 10816 bytes
SHA-256: 4ef686c1313d0d1f631465d192d4d255a6bf3fd13462ed5dadf8f6d815ed9b69
font_02_sfnt_off0001abe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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