Malicious PDF — malware analysis report

Static analysis result for SHA-256 e598158f54293960…

MALICIOUS

PDF

81.4 KB Created: 2021-09-03 17:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5d0d84b40b9e8b2fc9af97d7cff572c9 SHA-1: e3f19280fe08eaff679033709ccd61dc9029d42c SHA-256: e598158f542939601360e61a60775238d44335d66f2ccadc6e089a821aafb58d
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The document uses a lure related to invoices or catalogs, directing users to download further PDFs from compromised websites. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it acts as a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32ae5cdc1d---nipero.pdf In PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/sibobexategepovavut.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/wofatomozelurazafug.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e2f821cc1---85865972868.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090c0d94fd46---dunogo.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/76889214922.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/33757f36cf05201f1de0a174a0f41226/82986927380.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/17619713844.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0db492609b---71339379755.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/guvijiwuzinopidaxakazigon.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/vowesuwokazeru.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/dozumugib.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/dvrmsetcjvc47bs6v2j9b697qg/66627934861.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac22d95302c---komelavuzivimel.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/4f196da58f7d248f07bebab7e826c502/votajabefapod.pdfIn PDF document text
    • https://goodline.by/userfiles/file/19888442341.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/4e41db9300a6ae39a7914ea78d9f398d/vejapibudogafedowumupuwas.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/uq6bhqt0778ep6fcmh0pa8knc3/63457707290.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/8e8b54d01b9531b7412bb5de5d4dff9d/ralikizodiduzugegovera.pdfIn PDF document text
    • http://moawin.org/editorfiles/userfiles/files/70272046376.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be95b1e6948---xosatux.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d66v4p46cvrmtthcqlkqo5b8p6/bolulorofujanusawo.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/3601847274.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210803232215.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/24907256561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=vicky+form+catalogo+pdfPDF 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_off0000d45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45A 19924 bytes
SHA-256: 49db486a7315d12aa14a8815f36e54041deb5a93ccb8d57c930c297d72473864
font_01_sfnt_off000107c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C2 10732 bytes
SHA-256: b9bc68b38c58aebb648c9f5bae921bce8e5eaeea1adb7e37d420f722e9a23718
font_02_sfnt_off0001204c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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