Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4b4a02d509be39…

MALICIOUS

PDF

100.2 KB Created: 2021-06-27 10:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 759cb4b7203fb96aa1f7acd8378a5302 SHA-1: c8649c4c0be0d9288a58130c6fa7c3274da7ac58 SHA-256: ad4b4a02d509be397c5d72a82d89897804475c166bde9cec204bca2da3f95cad
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised websites or disposable hosting, characteristic of a link farm used to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL analysis point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://orhs86reunion.com/clients/6/67/6744625166a0df26c7abb40948833271/File/37113000072.pdf In PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/avpmsjkt32p2sf02qd6vqdr07g/54841993990.pdfIn PDF document text
    • http://abpaluso.com/upload/file/42987417215.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/11861uqu6e2fbjcjrk7kii2li4/lebubitebilefaxilo.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9688429b5---gevenavazepalijefe.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/9200913569.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/cfe09337f78ea6b605c9d28117efc25d/fupiri.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079b158038d5---93765279957.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/piwaforabasefexenu.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160b41e3aeba41---jegivofi.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/fijisisadom.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/mobiradotoriguturovu.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/gifimoxe.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/19681899582.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/dutukakajixinawuredimi.pdfIn PDF document text
    • https://renault-service.com/userfiles/lavotavikuxefifizo.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7091936f0---60610202764.pdfIn PDF document text
    • https://digireg.se/upload/3179808623.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/f2isq3hlkcsg8ukve9vm0rsknu/26671169429.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948fff1b756---26256644090.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/1cafba16f319e898abe956afeb07c4a5/boluxarebulazuxi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3cf92b213d---punodewopimazukiwinigufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+download+toca+life+city+for+freePDF 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_off0000fc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6C 10492 bytes
SHA-256: fdc8dd57768482ca4af256b40c245c52668c643a24d63dd7e093c064be93efcd
font_01_sfnt_off00011462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11462 16276 bytes
SHA-256: ef858b01719cec29ba59f81a977f79613a1aab7fbc1f32c2ef09c5dd0d876d7f
font_02_sfnt_off00012a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14271 32068 bytes
SHA-256: 0dd4fad7c6d379d38f94b104ce239c41fc8520e03a93c8cb91f902d001d8f9f1

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