Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4b2a2629f3120f…

MALICIOUS

PDF

91.8 KB Created: 2021-07-17 16:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a2fa71bde56586ff6275b5ee0839fcd7 SHA-1: d271809fd9f3a67efc2effffe6bec8cd94ba6e45 SHA-256: da4b2a2629f3120f15afbbb623209185a177a42ab6ec3ae9be7737d7189c9bab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kesherisrael.com/uploadEditor/files/jakaxapadev.pdf In PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/97998030852.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/bjqjr3dcsnosr7sgbs3tbh3ao6/88731489452.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9f6b5296a---49746624053.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a03accee1e---kexetimuzafadilalafanijuz.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/27291217160.pdfIn PDF document text
    • http://changecn.net/ckupload/files/36953589457.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/kiluvexumapitavuxi.pdfIn PDF document text
    • http://land89.com/ckupload/files/gozumoxiwebowipagopoxom.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/rovewiwufofeva.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/dogipug.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/58584741932.pdfIn PDF document text
    • https://progin.ch/ckfinder/userfiles/files/ratuxokodixaliwusebopub.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/16901920782.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/379b57d7184f4c64454278e676c79b7c/36316772201.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/18980076113.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/pikaregubonu.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097dd3213707---magijinepoku.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/2280385702.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b5c53abce---92401736923.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///46578215640.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/f559b630da6de89b15d0c8dc14a7d5ea/vofowizojuxivefi.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/56025281592.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/c5cc32f1c165802546296b18047f8bf7/rerurekuzeribefaw.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/zopojuzupisupopesesunad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=airpods+pro+serial+checkPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10323 10480 bytes
SHA-256: 7c6a6bbc83749d81e5536484f25c377bfc5b8bd0ec825efbbee03adca6a54187
font_01_sfnt_off00011b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13320 17300 bytes
SHA-256: 4b4997d06bd1514742337194fb479ecf838be38018610c528249d0704534f735