Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c0d63c0236981c…

MALICIOUS

PDF

86.8 KB Created: 2021-07-06 00:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 80871ee06920ecfc2db3e0335f10eccc SHA-1: da92e86ceea8938c56f4bcb19fa8f2838cff18fa SHA-256: 94c0d63c0236981cbc4c6ccbe25333ea8db45f67e5b9a56ba27a337f21c690f1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan PDF. It contains a link farm pointing to multiple compromised WordPress upload directories and other potentially compromised domains, suggesting an attempt to redirect users to malicious content. The PDF's structure and the presence of numerous external links indicate a likely attempt to exploit users through a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://www.thaiboat.net/image/upload/File/xokobiwejusuro.pdf
    • https://floridainvestment.cz/files/file/rexajusidebo.pdf
    • https://heritagecambodiatravel.com/userfiles/file/80257396419.pdf
    • http://palazzodiaz.com/userfiles/files/neruzukukironulelagis.pdf
    • https://slaterlighting.com/wp-content/plugins/super-forms/uploads/php/files/fda53439bee042500d49227066706387/5416695310.pdf
    • http://associazionemillesogni.it/userfiles/files/vepomezujetugozutunuzofes.pdf
    • http://businessvaluationapp.com//fck_files/file/1684190545.pdf
    • http://happyhanool.com/ckupload/files/66667426232.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/54ef0ef05c4c5b49222a9e896b78e293/tevazibokoruxalapuwokar.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/98d8337310d2abb46cf274bc5f822c90/47487379642.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84d2628dfe---3901285369.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/801bb237b29fadec67655bade7dddd4e/91568059004.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/d197c445f5a4368551eb7957a7c9adeb/82710851642.pdf
    • https://akproauto.com/nbloom/fckuploads/file/telenidujowigaminapofufa.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160857e8a3191f---duzumisirivafevizakek.pdf
    • https://sindonis.com/userfiles/file/36504491483.pdf
    • http://ytovietnam.net/ckfinder/userfiles/files/23103016456.pdf
    • http://geobrofab.com/clients/d/da/da7cd3953015cd63472398095fc1fcdd/File/kabugidetevuzesovopovip.pdf
    • http://studiorumeo.it/userfiles/files/11174065907.pdf
    • http://papinchess.ru/userfiles/file/javinajiwapilul.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/cr90f72bq6adtkmm1or51skube/90131350137.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/825faa41331cf4c27d9c00531bfb80e8/xojikodematururenubezik.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/f84975768482e50f532ac315e594033d/tolededadijem.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=periodicity+and+extreme+values
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eab2.bin
010eff210d817730a222758a5184b1bd4d8e95976264cd8f6479af7060a46665
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB2 10912 bytes
font_01_sfnt_off00010406.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10406 16792 bytes
font_02_sfnt_off00011c18.bin
cba33101b0019d295b7d0416b6bb47171070e8b975022d6e4492416922cbefc7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C18 19268 bytes