Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8010c2ef6dab00…

MALICIOUS

PDF

75.9 KB Created: 2021-09-06 11:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 181abc4c999a119c6711375218379e56 SHA-1: befa692d1e5fe736241f2b22332be37a38df5c70 SHA-256: bd8010c2ef6dab008ff504a7140e6b268830b8e71fa5e864774b5d6027752733
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://garglob.ru/uplcv?utm_term=johnson+10+hp+outboard+motor+repair+manual PDF link annotation
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/7a5b8a34065f6db9a0d4f51986cc33d2/dewemipima.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/e96f400mdknh8fv582p74mm7oe/laxizav.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/dipetilopebupejozoluje.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/d8fc1e3dee1ddeaf6915ab5ade49fc1c/vonowibakefuw.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/wivilugonuwutowovebevak.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/dajuxazivu.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7ac1db00f---nadevunajiv.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/61899400118.pdfIn PDF document text
    • http://behbehaniprojects.com/uploads/files/sulobebilopebox.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/3410435161.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/jmf1n4ic000q2pkft4ci135atn/raxadesusizadabu.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/nevizezegixu.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8ad08908b---95840955284.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5db4da6a64---13290557403.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/32638599890.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/jowuxirugovun.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/wobededeludenekaxelutipa.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/jivogakajowanale.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160798b6451d5f---72327639801.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/22417374486.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ae938afabd70be548944b3394d316f37/95473301981.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/walilosukebotivodagojufu.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072d3773099e---mukuxufom.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f0692e1fa---19509508180.pdfIn PDF document text
    • 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_off0000c1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C6 17492 bytes
SHA-256: c8995d9c6b7f3f92ef6407be3fe68595ba7443b7383f8987ff8b8dfda83ee2d3
font_02_sfnt_off000106fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FA 11064 bytes
SHA-256: ef6695183a961ccbf51e6fcf441ca49a14c1c2c4f6acb602dedd38cdc9dc283f