Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ef7fa48b2eb64e…

MALICIOUS

PDF

83.8 KB Created: 2021-09-17 02:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0dc3b0d203afb422174020c390f1b350 SHA-1: b14e5bf8221788d312a1867ec30a008abad5d19a SHA-256: b4ef7fa48b2eb64ecec8ed1e4d494ad149be6d73c9d1a9206b17896c9161385a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, indicated by the presence of a deceptive download button and numerous links to compromised websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a secondary payload. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=shadow+fight+2+level+max PDF link annotation
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/1c26469b9e71f23b2c8b0ad8d7853841/30079559764.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161300c2e7db7b---mosibufezaxukinatowuz.pdfIn PDF document text
    • https://angkaindaman.com/contents/files/dabikasepubipozuwapevow.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/jomuzilugikajebiridelan.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/zekil.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/3d82hecs11jfi7s0tl1aj2l1c7/7039340466.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/26168775594.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/7588677211.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/40062853318.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/xodopodamaxebanuvifuxor.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/pujunaj.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/ro7p9hg6s1b65fukeoqqkma2m4/58670090835.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/e46ba8d086d619124f143567d515a80b/82653789353.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/katoti.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/14563089407.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a10cdc78e5889371f0122cb89266d507/54673112245.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/48471881066.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/65723651976.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/koganovipob.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/78913824470.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/79c3186314900239545838a93286c078/dawefiwo.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20219325383487.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/99253028089.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-6/20210906080527648153.pdfIn PDF document text
    • 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_off0000e1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A3 10880 bytes
SHA-256: 925a3338fbbec70519bb8938ed4e6ed4abe873a614ee58c6dfc5971914e4edcf
font_01_sfnt_off0000fab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB5 18156 bytes
SHA-256: f351c87f58cb1fcfb701743f620b1a2db8de1ff21a80c67035640c38cec9bec9
font_02_sfnt_off000129f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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