Malicious PDF — malware analysis report

Static analysis result for SHA-256 2deb3959fee52d5b…

MALICIOUS

PDF

85.2 KB Created: 2021-06-29 17:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1b7910552454de822754fdd1e4520959 SHA-1: 41c57cb9442c6ebaf774b970dafc9053e5544da1 SHA-256: 2deb3959fee52d5b9a459fb8e3e1a8cc48f5ff7600c980adb26586d6631e331c
196 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a browser extension installation lure. The document contains numerous links to potentially compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were directly extracted, the nature of the lure implies an attempt to execute further malicious code or steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://shiokerbau1.com/contents//files/sizumoxujolet.pdf In PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/8ltuaer2ei8bl0sbe6lha7f582/60572103275.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa79ae9ce43---jusipewunilibumuw.pdfIn PDF document text
    • https://arerp.kr/data/file///41192766706.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/womubotolumano.pdfIn PDF document text
    • http://teifsepahan.com/files/file/dixigutivaretubasumo.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609432dfd74de---67292227772.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac80d5c13dd---19513563174.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/98224602159.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/juruxovuke.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/tiwuserejemixenulowegi.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087ff6baa733---43453535654.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/olq62nhojaqhjjnjlp38vs3pt3/gubajonifilepeviko.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e992b5232f---revifenibugazutenarolo.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/b686e53cde36fc7450cac5358f14a6a8/53007107983.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/66825149555.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4b5fd3549---folugipugekesotepemod.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f8d21762d---90107663799.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e9ca13b37---73279160665.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b856c755f---95811900702.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/43703797858.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160892b62c5bc0---wakipep.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160aeaefc69057---38555098229.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=related+rates+problemsPDF 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_off0000eae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE0 10544 bytes
SHA-256: f38db811562bec270defe77025a35f551b162b00e48ec5520bb2285679c09e82
font_01_sfnt_off000102b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B0 17316 bytes
SHA-256: 716fdf10c63ae33a53e92d061db3a74309b96dcd5003ddaa33e6fb552f853d48
font_02_sfnt_off00012fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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