Malicious PDF — malware analysis report

Static analysis result for SHA-256 5da2b9f2e0050edd…

MALICIOUS

PDF

76.4 KB Created: 2021-08-12 13:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 05f69563e03779b21f908ac77c5c823d SHA-1: 352a5ef6da6e2c52a926694f72ad3804ada15e32 SHA-256: 5da2b9f2e0050edda977e0b856f286d631b8d8b0d92917dc17f4125d5475e60b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users. The PDF also features a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious files or redirect to phishing sites. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://mytalk7.com/_UploadFile/Images/file/7614977104.pdf
    • http://www.annaleehuber.com/content_files/file/90084932878.pdf
    • https://arnetbilgisayar.com/upload/ckfinder/files/88496237465.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc5c49ba1b233c7922a6539a1b7e969f/faroxajozisufimibigalefo.pdf
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/maguvabukazagevidimigeje.pdf
    • https://empezo.xyz/js/ckfinder/userfiles/files/pesetuvopitikibej.pdf
    • http://playbabydoll.com/userfiles/file/fedugapejepagogaxefet.pdf
    • http://montaze.org/democms/userfiles/file/zivapotizojuwifakapudu.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af75d70a25a---52892764393.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d15d09e59---28652073986.pdf
    • http://columb-sklep.pl/userfiles/file/61782808194.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dd80fb488ab---94013276081.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/hsflm6tia98pkao986bnjuptt0/62959006710.pdf
    • https://davaocarrental.com/images/file/60404837505.pdf
    • http://glttek.com/userfiles/file/zixeruvagadiranu.pdf
    • https://atl-50.com/files/file/molapepikurugajebupi.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607017cdd7d2e---wapigepurajubakufopinafo.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/edc072f7ad7905ff916ce62ff5a25a07/wejujarosetesugekinomuxex.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/tqcpl11bm2pnmjuth9k1r4brr2/sojofiludebib.pdf
    • http://aceonlinementors.com/userfiles/file/tudafasaweriw.pdf
    • https://go2germany.ru/files/file/bajaxav.pdf
    • http://sgpeo.pl/users//file/dipawe.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/l0sk8dei0sfahme02jr13g6cin/60244650134.pdf
    • http://olddieselparts.com/ckfinder/userfiles/files/nagarone.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5743cc634---fezokuwozitijifalokufufo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=paraphrasing+exercises+intermediate+level
    • 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_off0000c4b9.bin
7876c9ce931f7c627faa3d708f8702ba9ad6f1f950643f33e60c8107632c3705
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B9 11008 bytes
font_01_sfnt_off0000ddef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEF 16792 bytes
font_02_sfnt_off0000f601.bin
252eef0feef8032477c8b472c0bb478abdabcea639862a7b30b243090d263353
pdf-font-stream PDF embedded font (sfnt) at offset 0xF601 16836 bytes