Malicious PDF — malware analysis report

Static analysis result for SHA-256 7033faaabecbd850…

MALICIOUS

PDF

90.8 KB Created: 2021-06-27 05:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d3e40e58de8116ad1fde2740b0f90412 SHA-1: afcdcdffa27fac1d0540fba453071179df93cb21 SHA-256: 7033faaabecbd850a8764304899fdad781dc37353f399d640c942f069cd9130b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to compromised CMS upload storage, suggesting it's part of a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://coretry.ru/uplcv?utm_term=sausages+with+lentils PDF link annotation
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/9dbb7c79b1a13f31a36cef8741657284/famawewesaxaxexunerisugi.pdfIn PDF document text
    • http://cecev.com/stockages/files/vuputekidebipuno.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160c67d4971b0a---lijuponarojalevedoreg.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/xokitekojemijivamu.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/d2d18cc4ba41a984be34d7766ce5dd7c/mimekabewiredoni.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cc5455eb1---81811481566.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087f66d90da2---60770656953.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ffe4bf307---kafidasakejipopido.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16086f41cac02e---meduwenujuxovas.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/libilijatusegu.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/ac700d8a3a69f0e0088686982b94fd1c/76053276331.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/o37f278h94mer9qci00jmruuve/14648422808.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/piridodesixefobedavezabu.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/1beb4ae6e6b7410f4e7c317a047cdc2e/5277354803.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf299c6e12---41303499814.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/2897419054.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/58694999bb1fe02246edf2b7dc875867/23135065293.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2f32c0394---teloxugu.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/nekesotofovu.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/05fb2b569d1c5bd33869116973d1a5d6/gipepizotifes.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/nlluip77e40ddcnpg0b8nooe30/tanamotanasixiva.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/xagewowageditibix.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A3 10428 bytes
SHA-256: b318dfd3cd682e94e6aaaa2397838952705bc373a6934953b6b6b03fa3cea368
font_01_sfnt_off00010d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001254d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254D 1696 bytes
SHA-256: 28c5bcedffb0f63c0f18ed07264126f7c833899b916de9a351f9850be7cb6bae
font_03_sfnt_off00012d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D59 18560 bytes
SHA-256: 7b85a4a665cae0586b51dcbc6d4270e8983840e2c70279b922a5ae1f77883666

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