Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a77d1cdf2a0e2bc…

MALICIOUS

PDF

87.4 KB Created: 2021-09-22 14:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bad6ce8f97a002b3d121acc28ee6513d SHA-1: 1307312dd678338e0c9a054996bd946619af36e4 SHA-256: 8a77d1cdf2a0e2bc9b7274e3f57e0dd4fd419f34876b83e060c3452cab74f5c5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains numerous embedded URLs and is flagged as a link farm, with several pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure, but the presence of multiple redirector URLs suggests an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://huntic.ru/uplcv?utm_term=samsung+a70+vs+iphone+7 PDF link annotation
    • http://www.insight-assessment.com/ckfinder/userfiles/files/barejutuki.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613813fdd57dc---37466815242.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sijupuxigapatu.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/95254244954.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/fosexedupozizateref.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/tixukudekenude.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/lalajadojepin.pdfIn PDF document text
    • http://identik.hu/editor_up/50226341203.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/37448711771.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/dimaxinexuxaxesugefam.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/supobulemazav.pdfIn PDF document text
    • https://www.aillant-sur-tholon.com/ckfinder/userfiles/files/48718686988.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/fafidij.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/54153612360.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/59162637326.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/wolusurunikarewomigujan.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/fatizifadivivaxokegedo.pdfIn PDF document text
    • http://airmon.hu/images/files/besoponaligabelarewibajep.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/jugigawitigu.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/1b663f467215b797c31fce44fae0dcfe/kajatemamatipibulusove.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210922_5F10854478053FC9.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/sitefujup.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/2a59577a21741ebde1e402a5e18fdce6/jinanokiba.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/wokizexixine.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_off0000eeea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEA 18276 bytes
SHA-256: 0c2c35c98c2b83b3c485dbb26627090d15cc315b9ecd265c072ab311f0923317
font_01_sfnt_off00011eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136CB 10868 bytes
SHA-256: 43dbad90a8f9ceb8dcab8d50c64005bf3f2fb66a15a5d28e54426cba47917092

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