Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea654d32b35d32b9…

MALICIOUS

PDF

69.4 KB Created: 2021-10-09 10:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 84a84a6bee6a4a67872266e0ba4e413d SHA-1: 485c4eb35d41862d0ca2f53f78673bbb5daaa6a2 SHA-256: ea654d32b35d32b9a9dc1874e9d8ff2ea4c4e1e3e72b6d2ce6aaf99067bddbfa
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate it's part of a link farm pointing to compromised websites, likely to host further malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript potentially downloading and executing a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://quimis.org/js/ckfinder/userfiles/files/bomexulimifa.pdf In PDF document text
    • http://thebookmarkcafe.com/uploads/files/miniwelukukurunosobuv.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/venifov.pdfIn PDF document text
    • http://gibisch.biz/files/files/zufadovaluj.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/96343888090.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/52919903589.pdfIn PDF document text
    • http://cy2hand.com/userfiles/suzisanerut.pdfIn PDF document text
    • https://mamalight.org/business_school/uploads/file/57392685945.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20211009/file/16337427651297.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/12181923173.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2b2ecea51---46317566692.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/0ef94ca2f0a5384e1c3d92217fc4fe8c/39172350375.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/pebufag.pdfIn PDF document text
    • http://imaginove.eu/data/Files/bilurumonubafepunuvekow.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/rojojudejabibutilizozesot.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20211004175154.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/42172040762.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/kilopisumokawazudi.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/44624555290.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/4da7e1af65031ad8bf2083fa96807573/vuzituperibuxukukisol.pdfIn PDF document text
    • https://petek.biz/resimler/files/benirosasaxebugor.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/16349414351.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/jopitifomiruv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=pregnancy+scan+pricesPDF 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_off0000b2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BB 15080 bytes
SHA-256: 98c0fe8ab0fed1679332433b4aeb6aa05f7b0dfbe8542beed509e62cc3eb6e2d
font_01_sfnt_off0000d86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF086 10400 bytes
SHA-256: 96321c66006059587cdbcab1654a1b671b5e9e9f5dfcfbce68fa65e9c9cda416

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