Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a366562e9caf182…

MALICIOUS

PDF

88.4 KB Created: 2021-09-16 21:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 87f97f29b1ec20636bc6007507b17373 SHA-1: 4fa647053dbdae1e19fef60f601f0bc03182b9cb SHA-256: 7a366562e9caf1826a1fd666c1ae20d966bc522e9498325c46d142efd1f6bbd9
176 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of 'utm_term' parameters suggests a phishing or spam campaign aimed at driving traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://chcial.ru/uplcv?utm_term=android+app+for+books+reading PDF link annotation
    • http://xn--m1age8bh.xn--p1ai/files/file/fazinop.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc8c1887da---19132336757.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613408ad5bfea---kujivogififepukuzi.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/69724546406.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/toxafux.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/vujidoduwezu.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1614130780d78f---73491204533.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/70983513380.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/r3d8hn9162hv4jevr8e2evp2p7/juziw.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1915c6a79---numemozisabemu.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/3pmrnckd5i2hu0fd8vi4h0r665/vefuso.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16132302da9ec0---posuxupopegenawobal.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/mivilasomuroxuxanagilow.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/70957999029.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/lajakikoz.pdfIn PDF document text
    • https://lsv-wittlage.de/ckfinder/userfiles/files/53610987509.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/43433790324.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613253a58869a---nurejivuz.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/kuzawul.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/ranesitopuxawifatid.pdfIn PDF document text
    • http://101balkon.ru/upload/files/29072645031.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/63743266730.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/fivefuseruzur.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/50357676378.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/mugumexusiko.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_off0000f524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF524 10744 bytes
SHA-256: a2f13e8e472b51e0f73d3dd208954b1d38adab4f2f1a126ff6d8ed4ef3163523
font_01_sfnt_off00010d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12597 18028 bytes
SHA-256: de1c042f1f6c3fe0615adf5393962aeb64316dc7844999064f2ee5ba842efb22

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