Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7dcaa5dbdbce0d4…

MALICIOUS

PDF

86.3 KB Created: 2021-09-23 22:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8002bcfff1aac181b4039f36a81cfaa0 SHA-1: e52fdbd9e1caf09a5a706b6f03d8503ab0c42ef5 SHA-256: b7dcaa5dbdbce0d45e223a23e78bedd75caa6e7452941925c5880142fbfc2b5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised websites and other PDF files, a common technique for distributing phishing content or malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or a trojan. No scripts were extracted, but the structure suggests a lure to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://linhquan-group.com/upload/ck/files/lepagifebenaradudopegadu.pdf In PDF document text
    • http://atek-ent.com/upload/file/84019341432.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/gemimatolafixi.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614723f591519---damosagokuxovij.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021091616535280554.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/8405e9521864397269a7651b327ed1c6/46380700414.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/gisagiguzofob.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/9160356449.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/lerowizavarekilolidipeki.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613eef2865cd6---tipejojimekodifijuva.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/pejok.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613034007b9d7---mododebibabegezazeteb.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/bojimidenov.pdfIn PDF document text
    • http://purel-biopharm.com/upload/files/jidojotajirab.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/74373173486.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/vewugulafuzudax.pdfIn PDF document text
    • http://grimastone.ru/files/51885895832.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/latedurutufemikibuz.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613c764003266---fiwuzurudew.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/jizawujizijarozapelofovo.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/24662419156.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/95333916770.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/nunefinageditexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=traze+contact+tracing+apkPDF 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_off0000eecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DE 17316 bytes
SHA-256: 162cea72cfd5cb2d48f3f539cfe7dd5b9c779fe24dc5c2850838c4c21d74d616
font_02_sfnt_off0001339a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339A 10448 bytes
SHA-256: e2f19744b0337974231ed4e2cf40292349a6635f26660415f6298c22e732b2c5

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