Malicious PDF — malware analysis report

Static analysis result for SHA-256 42bd3d158ded6904…

MALICIOUS

PDF

71.7 KB Created: 2021-09-10 00:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9c890bc023c01b13737439e6a208f30d SHA-1: dc9529155a07f8cb292157b87348ddb67b91a132 SHA-256: 42bd3d158ded6904d384f20641755c9241742434af6773bf8d11edb16bbb9f03
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to multiple disposable domains and compromised WordPress uploads, suggesting a phishing or malware distribution lure. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://catamma.ru/uplcv?utm_term=adivina+quien+soy+esta+noche+pdf+google+drive PDF link annotation
    • http://anabakorea.jp/userfiles/file/36226690731.pdfIn PDF document text
    • http://aurora-c.jp/files/files/23061319221.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/80118234d07cdaa0a98cd06864e9868a/69550365762.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/xemijiraduv.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/popokuzodelurezipe.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210901153001_y0bifv.pdfIn PDF document text
    • http://juha.be/_files/file/wevegusifopaserukose.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/49953625276.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/lesapabotoli.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210906214557_ghk6so.pdfIn PDF document text
    • https://seikai.jp/free_images/files/73962725919.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/1425308995.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/gonopoturivomujemunu.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133decf1798e---2892690428.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a7010804c---jevokisidasim.pdfIn PDF document text
    • http://cartopack.com/Images/file/98396942747.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/0hcm7v87bifd6naisf0a3dhvt6/kegetatidis.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/70930964100.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/bedupefebotifetusiluj.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/gopofawifaginesi.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/bepupejuwogenuvezivu.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/88633453458.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210902_D772DA8555C85709.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/nesugowejubuzabofob.pdfIn PDF document text
    • http://headrepublic.pl/images/files/93623136717.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/kixonisukijipisuv.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/nidugedelef.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_off0000b426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB426 16448 bytes
SHA-256: 5cbb60b9a11e1004e4dbb0a21b4c3746e8e434ededd29fff19d025389f40b60b
font_01_sfnt_off0000dca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA4 11308 bytes
SHA-256: 1eee501d2e39535870fddf48935e1d7b200393b0fd85ca365284618c9f5e03d1
font_02_sfnt_off0000f6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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