Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd0057e02eb81c2…

MALICIOUS

PDF

82.0 KB Created: 2021-09-21 04:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d11f176c3bc76f304db238e1f5d1225b SHA-1: 73071bbfae5e7f2bee24706ebe648a7ed311e1e6 SHA-256: 8dd0057e02eb81c29c9d41575d324f239df5a483275fb13f1318c1947cf23961
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple compromised websites, suggesting an attempt to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links on potentially compromised CMS upload storage reinforces the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://alteanetworks.fr/img/file/87148261819.pdf In PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/cbb67a29tt7g5s2ubkcbjbe364/98587672054.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/rutip.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/18684277530.pdfIn PDF document text
    • http://beta-rc.com/upload/files/36358940232.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/39379043309.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210910114957.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/62434713472.pdfIn PDF document text
    • https://kristinanamaste.eu/files/33418121088.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/6692095310.pdfIn PDF document text
    • http://tdbm.vn/upload/files/67380636856.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/f5a1b87fbed60dee7394ecfddd4e1889/21681083777.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141d20ee4921---pefekafafokadifiju.pdfIn PDF document text
    • https://webrobogo.hu/kepek/64564810164.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/kajuzozal.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/vewemetedo.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/zezajusegup.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/badazewaliboribawejerazud.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/litubapowowazeso.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/zibemiwurofutix.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/rivodafetafesidezu.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/pegita.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/ravituvupasejalabo.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/puvobesak.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/ladobomim.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/161464a88b37a9---37447849723.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/bodap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=sivaji+full+movie+tamil+onlinePDF 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_off0000d762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD762 19396 bytes
SHA-256: 9bd4b5eafe5606f783cac8b2888662392a55713478f17e51f22889923b8cf925
font_01_sfnt_off000109e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E6 10476 bytes
SHA-256: 68e14fbbecaa8de729c9d5cab277211d755d8740401d49d3e0bd334eeff3ed23
font_02_sfnt_off000121b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1