Malicious PDF — malware analysis report

Static analysis result for SHA-256 98bf25a1b56f523e…

MALICIOUS

PDF

82.6 KB Created: 2021-09-12 05:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0eeab9b40ffc340fcdc1030d1e31831a SHA-1: 973305215a8250403021b2630b32dd040167856c SHA-256: 98bf25a1b56f523e977a2713c2eae56068629868eb3e720cc69d89063b22d537
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm pointing to compromised CMS upload directories, likely to host or distribute further malicious content. The presence of a 'download button' lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • 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://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16131836f4aff2---notekup.pdf In PDF document text
    • https://mytshirtcreator.com/app/webroot/files/file/sujizuxozazifotosi.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/bevot.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/5385998842.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/xalobaxu.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/89019469881.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/zixizesavakud.pdfIn PDF document text
    • https://ivantomanov.com/userfiles/file/30007462458.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/70895469486.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/96150908705.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b59d7b5a3a---golibopetewevaledepijis.pdfIn PDF document text
    • http://dogable.de/userfiles/file/76303165924.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/xumovibu.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161388370b478b---17738783360.pdfIn PDF document text
    • http://fitviewer.de/files/file/vununosusoxunodudogu.pdfIn PDF document text
    • http://nfc.soo.jp/file/tiwobuxurufarugurixalowim.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/88778362226.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/20428979235.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/werox.pdfIn PDF document text
    • http://rowadalbyt.com/userfiles/files/29273188089.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/lowages.pdfIn PDF document text
    • https://kalendarz.probik.pl/fckeditor/userfiles/file/75696973596.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/jamakakironu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=yeh+jawaani+hai+deewani+full+movie+free+download+mp4PDF 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_off0000d9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CE 10940 bytes
SHA-256: ae86a596fae49a905243ec778410330c6e122a4460420cfd7db86a8f1768ee46
font_02_sfnt_off00010ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE3 19120 bytes
SHA-256: 518472eeb7a312d64b117f7c40e4e4f1781211cbf226469eb89823b711ab1ae8

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