Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b265c64025acb6…

MALICIOUS

PDF

107.1 KB Created: 2021-09-13 14:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b632ba6446ec11f1870a66103d9462b1 SHA-1: fa3da0184537681d0abfd9fe2841c021f94a3066 SHA-256: 20b265c64025acb6c02aa98187f07ac64b448592b1680d17dd3e516ec3785a6b
164 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm designed to host or redirect to malicious files, with ClamAV detecting it as a phishing trojan. The presence of a 'download' button lure and external URIs pointing to compromised CMS uploads further supports a malicious intent to trick users into downloading a payload. The document body is heavily obfuscated and does not provide direct textual clues, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9828

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 http://www.cerel.eu/images/wyswig_images/file/jemudaxe.pdf In PDF document text
    • http://1-cities.com/blog_images/blog_/file/89835327865.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/95964898120.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/jeginejewofatafid.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/90999737261.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/50462558344.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/23534955947.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/2656704183.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/5ae41a245fb1616ade9adfcf25bbdb03/22071630251.pdfIn PDF document text
    • https://limsurempat.com/contents/files/dipurolugufedijel.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/76962410430.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/fulapabilenizolugum.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/moxavurobuto.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/pononosafedilaxavunobak.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210909151026.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161331cf1b20b9---83797566666.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/37886771373.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93817293680.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/20078222012.pdfIn PDF document text
    • http://millenium.moscowfashion.net/content/xuploadimages/file/wopesi.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/tipagakitodomewukig.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/retinobavafug.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210906215415.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/43689092478.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613227040dafa---6565460551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=download+autocad+2018+with+crackPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00014837.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14837 17944 bytes
SHA-256: 49d43a9bdb2d4650317df55c1445636e3979c966d2e7c6c937ebbd17c07aa168
font_00_sfnt_off00010599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10599 26536 bytes
SHA-256: 975d07840196258864f7f097d09e6c3d9747ac085c704d8918e5249e0b93b3ca
font_02_sfnt_off000163dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163DD 10948 bytes
SHA-256: da6404c2ffa08c8d30842b644781bf0e676be94c4d5e4af72c246daf21587dcb
font_03_sfnt_off00017d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D4C 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_04_sfnt_off00018548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18548 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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