Malicious PDF — malware analysis report

Static analysis result for SHA-256 f625a4968f3c72b1…

MALICIOUS

PDF

84.5 KB Created: 2021-08-20 09:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 673573c06e371fde656f45bde2bb86d2 SHA-1: 0f271488fea01f34fd915304f26b2ce58864c0a3 SHA-256: f625a4968f3c72b1666ec9981404ff9b97e1925af01e582d9a25187e934e4a55
176 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content or downloads. The presence of multiple external URIs and a link farm heuristic strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • 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
  • 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://nhadatv.com/webroot/img/files/nogekadonawatavax.pdf In PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1a64e3daa---29868133000.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/8875b99eae46231dd75d98ef36574ece/5918838490.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/bf9a74800c7048d2f15f257297c77230/90612209508.pdfIn PDF document text
    • http://smiletoursvietnam.com/ckfinder/userfiles/files/69441024259.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/1c9d8077703c6a85aa069f381cd5198c/82731373735.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/29361ab7ff8d5429ae6285e6fc933a32/15602915376.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/xesiwawifu.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/97913779547.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e266d66b52d---fuwitawolu.pdfIn PDF document text
    • https://eubeer.vn/uploads/files/kegugusoselubajune.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/82008824858.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/jufemaxipivamizuwip.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a87f801d8---22214458019.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c187a6894---vujixurifapi.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/85670744857.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/62qtsug87b31rndnb6iio3pgmv/rixubazizugewulabubixaj.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/xujelajifitiminaj.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e284e772baf---81860304339.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/88969163059.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/30417197373.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49ed27472f---44987283715.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d85a7b39431---sozodorenipudedilil.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c33ade3ee---62554104470.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/56777474955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=download+game+yugioh+duel+links+mod+apk+2019PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD978 18048 bytes
SHA-256: 17ded5f0248e859f62c0d37c409766773c10acf60cdb5ed0439e8e60cd005134
font_01_sfnt_off000108d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D2 1760 bytes
SHA-256: f2626b06887cda3e86c47f47208e1fdd1bf8062f5df5acb54bdebc18060ba986
font_02_sfnt_off00011121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11121 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12938 11496 bytes
SHA-256: 012b953a5fbae0289d929795cc5fbcd3f61ecba2756f0f69d4122b5de57a9197