Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5fc5a3fa87b355b…

MALICIOUS

PDF

90.1 KB Created: 2021-08-09 09:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2189c710a95fdc29726ea64cd7d8b0ac SHA-1: 558a3947538b5dbe062df25503426aa2374d066e SHA-256: c5fc5a3fa87b355b630dc8fc80df5f6e36daa98df4620ead000a63febcd4031b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress upload directories and other disposable hosting sites, indicating a link farm designed to redirect users. The SE_PAYMENT_REDIRECT_LURE heuristic strongly suggests a business email compromise (BEC) or phishing attempt. While no scripts were explicitly extracted, the nature of the links and the ML classifier's high confidence point towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://bougerpourstarlight.ca/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/52302912544.pdf In PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dbc0053aa---pigonulupo.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/gozejejipokezusazenarufil.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f40ea78237---balizebagikofexenafipi.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c638c3b3281---15080050215.pdfIn PDF document text
    • http://iccarrentals.com/files/file/solutaluku.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609eac0d466de---xesanolazizidazapusi.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/56423787109.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869b3226f4b---mukorowexivixonobomew.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/20063176147.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/ff2o4087qo939ujnfr2i8ia61i/25939659086.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/48099075424.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/84526347772.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/9eb7daf7083981a962f5306fc0a4ce80/8079484593.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/wuxujutidifazel.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/5p44rmtr4bqbn2of8s33qskfq9/nunavowibexenumubesul.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/zewemobugigijonoka.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/bbg8f76bi3ehl1egm2guskg0b3/26333311719.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/mibirezamuwed.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/50c9162f141e819128b7acb8e9855ec9/56850389904.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/zigodeg.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/26351435352.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/1cfo5r3imb7o4o841gm9jfh1e6/35226721528.pdfIn PDF document text
    • http://dhf-china.com/d/files/9876793468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=what+is+a+ptc+cust+ira+fboPDF 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_off0000fbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF3 10528 bytes
SHA-256: 3c0e056104e1d760c422afd7dede542acfc49e9a889e60e10f83e3290f70c21b
font_01_sfnt_off000113e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF5 17584 bytes
SHA-256: 5cc4b90a0f993543e3a034b102219b12cc3b03fc887c7dcca87902a92c1486ea

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