Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc579a411f69bab4…

MALICIOUS

PDF

68.4 KB Created: 2021-09-18 11:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 449065e5abc7a61a8655463d35bb2213 SHA-1: 62c8ebe6a56a9cb2097e277df819b73970f3f29b SHA-256: bc579a411f69bab4ba2fd9770dda94a581f0c37bd8439d1e43743fc501a63427
176 Risk Score

Malware Insights

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

The PDF is identified as a phishing lure due to its structure, containing minimal text and a single image, typical of a screenshot designed to hide clickable elements. It contains numerous links pointing to potentially compromised websites, including one hosted on what appears to be WordPress upload storage. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious content or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://midospa.com/upload/files/20383800016.pdf In PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/nupojogesevub.pdfIn PDF document text
    • https://vonia.mikludava.lt/images/files/27395975808.pdfIn PDF document text
    • http://live-net.it/file/67161774966.pdfIn PDF document text
    • https://campermagazine.tv/public/file/libagugevarowukawuze.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/noganor.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/tejodivezunowe.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/fifokesosaboxenikimabaf.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/44474814389.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ce084efb6---73844122039.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f8044cdbb---52625860928.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/junejulapuditupifaxofu.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109131323441374.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/16963782336.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/79443758407.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/37173204493.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/kasukakuzusoluwovi.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/51208399029.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/161408f3c77efc---26708881890.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/29363820515.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/51982414660.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/5986956769.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/mogigovinebixixojuwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+i+download+gta+5+for+androidPDF 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_off0000b0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D6 14184 bytes
SHA-256: dd12c999f6e98993b3e1cb51b41ad5e1dcb47a79606df0d2d15ecd40a0531510
font_01_sfnt_off0000d440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD440 10440 bytes
SHA-256: 0abe628d69424f212ae2492512d3f8c04710dab1df1d62c58c542377f50045d6
font_02_sfnt_off0000ebd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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