Malicious PDF — malware analysis report

Static analysis result for SHA-256 d41fa551e18e0e3c…

MALICIOUS

PDF

87.7 KB Created: 2021-07-08 09:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9ce73aba08711b0f4d1ffcc7fd3d3a24 SHA-1: eecd0759b41ffb92da6e5c6b1decace196fdd4d8 SHA-256: d41fa551e18e0e3c41ccf3baa150c8ff1066cd6154de064c097729af7cb4fc4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=ncaaf+live+stream+free+online PDF link annotation
    • https://ivanamihic.com//files/doxaratewegukewivov.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/repoxolofika.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c90c0c0e6d0---xumumoxuwaregipunosa.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/36603480940.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076a6044e34c---vavuzemafarukeboju.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/87124733526.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/65198522534.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/sazitovewa.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/2016795311.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/e5a9cbbd235eab6359d6e991f8fd73f2/novozuraforarozara.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed00ac9e97---45860245227.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/ef18dcbff9422331c6cc0a07635b7522/96456281500.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb51f7ad5d9---vilasoworamo.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/gasubuxexitojut.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/70343706867.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a090e79c7c4---rulikomazepesijobubog.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/98908808025.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/96311869354.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e5aa15f8b---zilumomotipok.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccb6a3fcb8---jemilig.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071685c1e022---fileberep.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/zojogukozeseb.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/22pe5qm2ktfp9u5ji4g5kul7r1/89223771049.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/7cbe78c8f499867f1c1c7347c45c7880/9339160935.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_off0000f47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47C 17140 bytes
SHA-256: 43aa3532f1d9bc64ede27204dcb930457f5b2cb0bb3bbad7e7a9dfaf9ed36ba6
font_01_sfnt_off00012161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12161 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13978 10540 bytes
SHA-256: a196b55c8e2fcd528a0c4c726f180b1da6c162612f8f3f664ee60fb09d42080b

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