Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dab6167cb58271b…

MALICIOUS

PDF

76.7 KB Created: 2021-09-05 11:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2efbda0019dc7485ff24925e4c0a503f SHA-1: 090cf460bbca4d593fb76147fc93b3af68d31078 SHA-256: 8dab6167cb58271bd03bf17177952aa0e184ddb47a4ace09d35b75e6a6571d0a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to lure users to phishing or malware distribution sites. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f744683cce0---28594185778.pdf In PDF document text
    • https://red-adlay.com/upload/files/zomolalixipikibanigowufu.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/13765675393.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/63b49d7b3bf9948d84962543875c390f/sumiliwukedugugik.pdfIn PDF document text
    • http://stembridgefamilyreunion.com/clients/0/0d/0db03be1a97f3028174cafb645c8c91f/File/9045625532.pdfIn PDF document text
    • http://espokebar.com/uploads/files/mujutidujafojefe.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/somutadumuwidanaja.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/43994248954.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/xotapemufebelunorofi.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d039174647e---14041081608.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160798f9867487---suborarad.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/kufavajakitigake.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/nuragiwadej.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/gasilan.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b4cf981efe88a3088599483ba828b684/59599774852.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/silufipivodavuxenavusin.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/28316484680.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bf82c9378---desepijawatifudob.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/599347cf16883ebfd01c90f6813b09b0/zididet.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/pizukug.pdfIn PDF document text
    • https://tepihtrava.rs//files/86266499300.pdfIn PDF document text
    • http://screen.by/images/file/jepinemofoziranurofef.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///50542605587.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/sasobavowosiwijalitepodek.pdfIn PDF document text
    • https://kapefashion.com/files/files/vutijedivajufupizunimi.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/24574158075.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/ae2f31368966450371453109024cc222/kekoviramuxedavar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=probit+and+logit+model+pdfPDF 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_off0000c420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC420 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC37 10812 bytes
SHA-256: 80a038974f1f8ea619bbca8b13bc716ccb76721d909d95f98674b0ed41917e09
font_02_sfnt_off0000f4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A2 18484 bytes
SHA-256: 28c550bc61891b6ccd0844b41b26d48ac3da81489c570ae6eb40bdd92e786845

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