Malicious PDF — malware analysis report

Static analysis result for SHA-256 818055e2522e92c4…

MALICIOUS

PDF

73.9 KB Created: 2021-09-20 00:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fb775acdc96de7f55412ee8ab30ab807 SHA-1: d56cefcd5513908964953af59a774f08d650c95c SHA-256: 818055e2522e92c448a3135ff96b57cff9505d484b6f02b22afa8298031a0d28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URIs and a link farm on disposable hosting strongly suggests the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 https://medvor.ru/uplcv?utm_term=kafka+on+the+shore+ebook+download PDF link annotation
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/26c218c1e35c3e24597e0488f8246e76/42457806600.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/voselosonivipixajok.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090215065613.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/zinivizow.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/dabonawuz.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/5261445503.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/40574638370.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/54731091788.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/52977898438.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210914130307381.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/vatura.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/xokiwavuzoravobibe.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d6eb52e3bbfc54be9d23d398430b87a1/77964938985.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/dosudowoxo.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/69624327193.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/53359037323.pdfIn PDF document text
    • https://redac.ch/upload/dotuzirekinamu.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/99450787228.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/4044784193.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/89559886563.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/pewixitapuxikofis.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/viterolekigesaxazizew.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fc93b18ce---jugirumu.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/firofevezomezibupewazi.pdfIn PDF document text
    • http://lulanjina.net/upload/files/59025608421.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/17442753256.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/69751089892.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/kafokunol.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_off0000bde1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE1 10668 bytes
SHA-256: d61d9f8acbcadecca9fd1162ce4bc65316a7c1c521a0dda68477fc565ee410ad
font_01_sfnt_off0000d65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6F 16692 bytes
SHA-256: ffce3c1c447a3396a5de054f9d7ae2d2d7037154c770684068690a9972102ae3

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