Malicious PDF — malware analysis report

Static analysis result for SHA-256 a77c759c2ee0b695…

MALICIOUS

PDF

86.3 KB Created: 2021-09-18 23:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b68e7ca5431c8741d947b6cf67273c52 SHA-1: 75bc1a4d40e9b9f79473e32214d6364826d503b9 SHA-256: a77c759c2ee0b6953eb190605cc17e22b1aad87604d4ca9515a6c9044ddf00fe
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_BROWSER_INSTALL_LURE' suggests the document is designed to trick users into installing malicious browser extensions or updates. The presence of numerous links to potentially compromised CMS upload storage and disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://beautifulhairstore.com/upload/files/45286670390.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/64c08c8c6a15a1246bd8ba5f689523ab/33765309393.pdf
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/86280647672.pdf
    • http://mtjjt.com/2013/upload/article/files/210903004659209467dc2yl.pdf
    • http://szguilong.com/userfiles/files/43390457646.pdf
    • http://dental-forum.ru/userfiles/file/kosabotagizekubutifex.pdf
    • http://beloezoloto.ru/userfiles/file/63158565860.pdf
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/wavuwatukuru.pdf
    • http://deauville.ru/files/file/gusubadufidiwigotubud.pdf
    • https://mirrorlink.com/public/files/files/xebiwusugeniresalabolada.pdf
    • http://serting.eu/userfiles/files/bonim.pdf
    • http://lexxyin.net/files/fckeditor/file/80089169719.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/24eca4d06d4114771a0e5f44bf948452/55432604862.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16139897e8b09e---bixorefasopa.pdf
    • https://blokhol.com/upload/files/rasilafixojamiro.pdf
    • http://orthodoxvaidikasanghom.org/userfiles/file/wefajaxozopifibiguj.pdf
    • https://pasationtravellers.com/root/FCKeditor/file/bonituwomupemo.pdf
    • http://dui-antidote.net/images/userfiles/file/32248409394.pdf
    • http://w-f-l.de/user_img/file/puximi.pdf
    • http://drcleancenter.com/uploads/files/202109051100362496.pdf
    • http://seyrimerdin.com/userfiles/file/22120153482.pdf
    • http://bannermaul.com/userData/board/file/virusesix.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+transfer+my+iphone+to+android
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/jesim.pdf
    • 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_off0000ed85.bin
1d37a195b93c0d9f193e96beba6d83ce09f0903522ab6c02f0874d0ff1ea5544
pdf-font-stream PDF embedded font (sfnt) at offset 0xED85 17412 bytes
font_01_sfnt_off00011a84.bin
917beab60beaf1a1bb9fb9705453093238e36dc9fd5eed33aac8ae1af825dbd1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A84 10908 bytes
font_02_sfnt_off0001339f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1339F 16792 bytes