Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3a49ae465fa74ed…

MALICIOUS

PDF

71.8 KB Created: 2021-09-24 02:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9342c55d2ed95794ded7610b4e3572f6 SHA-1: 971e8644d3ae1a243d39e7191f56828af1078048 SHA-256: d3a49ae465fa74ed56eb6755e915f0f89214a1ba21f47f5a6cc266634a0d517e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as containing a link farm, with several URLs pointing to compromised WordPress upload storage and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document's primary function appears to be directing users to potentially harmful external websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1614ceb7f176aa---widodiwiguwogojag.pdf In PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/zajodejemefa.pdfIn PDF document text
    • http://kaies.net/upfiles/210917074014532293iz5ro8.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/86234099765.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/xulilodofufakasotuwupazof.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/16189949609.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/punomawisuxi.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/numadupo.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16135ce037d8b9---27653705275.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/21609934385.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/70134529134.pdfIn PDF document text
    • http://mega.kz/media/upload/files/33552412667.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/vixudoziletituvedoparo.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/841bda8c95dba9272d0f36010bd57dc6/49472650753.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/e2cvucbudv42atbv2jo9o2d1bj/xurivezunuwotok.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/28629400132.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/83460645186.pdfIn PDF document text
    • https://rotitelor.com/contents/files/pexubixired.pdfIn PDF document text
    • https://finliz.lt/i/File/fovujilugoxipuzada.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/fisekewusowagumiju.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614b89bd94eab---80637308619.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210924071705.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/naxijum.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/dewujaralexopaxexezobebil.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/vofugajavigugifejifet.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/legikuvoregumemulafakimul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=nee+mukilo+mp3+song+download+kuttywebPDF 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_off0000b770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB770 15556 bytes
SHA-256: 548079a03e66cfc68bd2d5b3a054d83f5cc58782f8825cdde87b19f17ce75f4c
font_01_sfnt_off0000df7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7B 11316 bytes
SHA-256: 7b73c282bf7789f3c3206a29e19cebd23a2b1796bec15d09c0d168ab4880b3d6
font_02_sfnt_off0000f9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1