Malicious PDF — malware analysis report

Static analysis result for SHA-256 0335afdaf421b540…

MALICIOUS

PDF

84.7 KB Created: 2021-09-12 10:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 31bc864083c77ed213ad316b16530d6f SHA-1: 90a3db625435408ceec96d84f1fa671ebc494a7b SHA-256: 0335afdaf421b54097917b9d8e1d8c0d45894f5e5b58de3f1eb700db89b2a522
204 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating a link farm and a lure for a password-protected archive, suggesting it's designed to trick users into downloading a malicious file. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were directly extracted, the overall structure and heuristic firings point towards a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://2winit.com/Files/files/mojimonu.pdf In PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/57605306010.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/44351037642.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135bc07a7351---tojofuxamabolodageri.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/9680519707.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/gijitiwalosidazevemipim.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/xirazijesaza.pdfIn PDF document text
    • http://firegallery.ru/img/upload/kuwim.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109020043351230.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/82543777849.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/52975454904.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/kekekefujefurowemofumudum.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/zojomenoximufemaxu.pdfIn PDF document text
    • http://www.polni.si/Images/files/bitaxusezopasal.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613b83f35dff2---soropu.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d57c200207---veserawased.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/rimulevobotosixolofadapa.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/tabezipovojabizexedog.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109020631108939.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/68732843223.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/73491483979.pdfIn PDF document text
    • http://velo.hu/UserFiles/file/52945859704.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/24297383146.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/060621177358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=insta+recovery+mod+apkPDF 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_off0000de99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B0 10760 bytes
SHA-256: bdbc8d3fe1d4c66c4ac0d3f22929e41c04774db108110a31169cdf5151602a6f
font_02_sfnt_off00010f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F81 19888 bytes
SHA-256: 4d5196192a41fbf2dd87199817c9ff3040eda2803db1002741ce7a0d661f356d

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