Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b768c163ca21034…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 16:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b51be32f085f0e646e87176b7825b317 SHA-1: 0a631cc5c1aace6f5f9f51ab6d4cf241f2124bf9 SHA-256: 7b768c163ca2103400c3b42abef182bc448691add4e50f6f46ec6de1f6ca5d6c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.opsclown.it/ckfinder/userfiles/files/96216731293.pdf
    • http://prefinancovaniehypoteky.sk/res/file/76960720082.pdf
    • https://idd.no/ckfinder/userfiles/files/84910394475.pdf
    • http://pate4me.com/userfiles/file/61514727445.pdf
    • https://turkeyinsurance.info/images/file/76235532772.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613034ff10b9d---63651478668.pdf
    • https://udruga-invalida.hr/files/36899657187.pdf
    • http://olech-rzeszow.pl/userfiles/file/migot.pdf
    • http://klccpa.com/userfiles/file/dineg.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16137aa779f8f4---xesobijawutogediwe.pdf
    • https://bursakaynak.net/userfiles/file/43153452710.pdf
    • http://snft.ro/media/file/tivifiz.pdf
    • http://cattaneoarchitetti.it/userfiles/files/jegowudurirepobozodod.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cd249f651ad0b56fa637efc63fae349a/rigusofegosuvos.pdf
    • http://archpiudue.com/userfiles/files/wapiwalinonosir.pdf
    • http://shiokuda1.com/contents/files/8202915664.pdf
    • http://tuecpa.com/file_media/file_image/file/92979566645.pdf
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/vujuzobababodowazo.pdf
    • http://cosmikkino.ru/sadm_files/viregoledodalonuxif.pdf
    • https://catbasailing.com/upload/fck/file/depenaxi.pdf
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/dujubosagewagagetijexeros.pdf
    • http://shoreluxurylimos.com/userfiles/files/refalawetukidowub.pdf
    • http://noithatphathuy.com/Images_upload/files/nulumamusalivupuke.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=come+cancellare+un+account+google+su+android
    • 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_off0000d6c1.bin
027b752a80267a0d05b1e3a0dc75f8effd3d8f276295ff6964b81b07f6f5ddee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C1 10844 bytes
font_01_sfnt_off0000ef95.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF95 16792 bytes
font_02_sfnt_off000107a7.bin
62466c60e4a7df2dea4dceceaf46258d069cdb002d387d4613ffdb7e1db786da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107A7 17296 bytes

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