Malicious PDF — malware analysis report

Static analysis result for SHA-256 de196758bb5bb66a…

MALICIOUS

PDF

82.7 KB Created: 2021-09-04 04:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 27b2022bf67dbeb8e03794550a41e688 SHA-1: 22e8f01a3cde9df2c83c3f2f389b238410e9466e SHA-256: de196758bb5bb66ab622c3093f582d0ec8c46990974eb8192d37e4cef10abeb2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing attempt. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings point towards an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://firmykominkowe.pl/Obrazki/edytor/file/foxoxiditobufinimopi.pdf In PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16080747359fa7---jatilovutepaviviporaju.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/rerozi.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/9cf6b9165ab9d58deff5e4c06c796fc8/79024996851.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/11477123783.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777a0d85ad0---78328497049.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/eedbe43ed4219b85336b0bfaaf18c743/vejedinofobutakalejepa.pdfIn PDF document text
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/26165603710.pdfIn PDF document text
    • http://tebsc.com/clients/84181/File/legedemifilarojineforiza.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075de1a2e6a1---lifoj.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/dcshk22njrpkvotouf46mu3kp8/86457565415.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad398fbbd32---90704199844.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/14312757896094342f8a8fb.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/jijatekiwokilenuke.pdfIn PDF document text
    • http://cy2hand.com/userfiles/wolamesu.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/eg96tfqd9vttcvhg93aue99rm0/wonemogilomuvuzewi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160757beb574be---mamowowuvobavoturisaluko.pdfIn PDF document text
    • https://wagaskar.com/media/lupakaledolitag.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/8314709646.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608346c275309---48447823157.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/49049567263.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1609bee135da58---56525437856.pdfIn PDF document text
    • http://gekon.net/userfiles/file/bijemutaretiposom.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a44943657ab---10402607347.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a6b9394f1---robazokutolerirataja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=rearranging+equations+worksheet+with+answersPDF 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_off0000de9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AF 17324 bytes
SHA-256: 91e21e4a446a52d278bc99fc535555e0c0b7532f267a510f24f37ee5454298ee
font_02_sfnt_off000123eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EB 10808 bytes
SHA-256: 580676faa17be689aed838f9ff632e5961afa49eca9b89a9f05bd21804840791

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