Malicious PDF — malware analysis report

Static analysis result for SHA-256 537a0262b91ee5cb…

MALICIOUS

PDF

77.5 KB Created: 2021-09-05 14:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 37fe522a2c24b240553d96b20dfb8ff6 SHA-1: 05db47a00c5c7d67f82e51ef6350457c15ee0854 SHA-256: 537a0262b91ee5cb4d3229a6420867b198d2bd8dc222d1d57db6e050d306f71d
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 numerous compromised websites, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and embedded URLs suggest the PDF is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://cesmclassof68cheyennewy.com/clients/82478/File/fuvuwusazuva.pdf In PDF document text
    • http://cppzone.ru/users/blogs/file/jarisegusogewirixo.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609887c679703---28156176487.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f38d0b1db---86083209574.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/51853610706.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/161044ad7c7091---3467185191.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/zukabizoxujurumotatasalaf.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fuxazumexijobotanifif.pdfIn PDF document text
    • http://saydersan.com/firma/files/93965187434.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/pubavu.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/gobakasewib.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089604b9e12b---wifefawubilibekab.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085017ecdb96---disetajagisunopowukat.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/m1lueicvmmrg67p79bge3nv8a4/47675822604.pdfIn PDF document text
    • https://samowar.me/userfiles/files/78782889907.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/biditomomizipubifavom.pdfIn PDF document text
    • https://2acontractor.it/images/file/53947211753.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/75526897517.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gs4v999pcs7rrd4jf8orr5g8p2/livob.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/wivaj.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/2bgpgtqgp4r2emrt9a083vvfus/fumelijituniguge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=orange+manga+espa%C3%B1ol+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_off0000c703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC703 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1A 10884 bytes
SHA-256: 72425716c06be3536f98e631ff49ccac36c2430a23ec9aaa67c5f3abb23a8cba
font_02_sfnt_off0000f7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C2 18168 bytes
SHA-256: 10e5b39577aa3adaeece333c68ca9e4f126bea7029216d56f72f9bace5bd07ba

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