Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b535ff514d2841f…

MALICIOUS

PDF

83.3 KB Created: 2021-09-16 09:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a0452cc5d4891809b9343fb8d0861084 SHA-1: d1a74261741da17f527fabd68159ba1e75881f0c SHA-256: 3b535ff514d2841f508affc1077fa3b8fa1a88df6991dea0cec153b177cab4c8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a large number of embedded URLs, many of which point to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of external URI heuristics and the PDF_SEO_DISPOSABLE_LINK_FARM rule suggest the primary goal is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=app+cloner+install PDF link annotation
    • http://szm.hu/userfiles/file/23362159309.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/munisuwixidisofajowakaki.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/xazoberufajopadi.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/a88f913f1d6c14255e6e4149e6ea5946/lotabifapobifobifi.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/wubujimekinu.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/fudiwere.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210902135452.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/56823088856.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161404b1bc8e3d---53381493297.pdfIn PDF document text
    • https://mkontakt.com/dat/file/99863637950.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/38208589554.pdfIn PDF document text
    • https://thehouseproduction.net/file/66610413910.pdfIn PDF document text
    • http://africareview.in/userfiles/file/22295104564.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/xuditufozamepufawoxunasu.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a68cf202f1---18950081415.pdfIn PDF document text
    • http://mhzsolutionz.com/userfiles/file/14324607915.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/2021913191455.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/34013737793.pdfIn PDF document text
    • http://pvvc.cz/files/87367908213.pdfIn PDF document text
    • https://lyubomiradineva.com/files/file/26676663414.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/55484875761.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/bujarovodevenegudabaza.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9aad8364c61be0062f08614b0444a8fb/wepiravizujuwesovepodaxi.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133a643a7df4---goposuxono.pdfIn PDF document text
    • https://susta.vn/userfiles/file/68927129406.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_off0000e002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE002 18376 bytes
SHA-256: 470bd23d7afd79cf49338b4a3f55ff46a7233cb02ac64b375e9df91b3136edf9
font_01_sfnt_off00010fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E2 10348 bytes
SHA-256: a9b8c99e8dc04a04c998965e68ed05bb083a0926723dd852f05f7e0f02c92317

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