Malicious PDF — malware analysis report

Static analysis result for SHA-256 01f61c066dcb75ab…

MALICIOUS

PDF

84.8 KB Created: 2021-09-07 01:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 5b27f4038df121bdbc1d2e77e12d9cb5 SHA-1: ec0b6fa1e61d7266ed8df6b398eee51d00632589 SHA-256: 01f61c066dcb75ab44e34d64e8a57cba807113990ae13f17c8f95d354d028694
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure and a QR-code lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/mik33e7nqptrrp3vtvi3bg41et/mazogevar.pdf In PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a7176192e7e---libalopevavepakozugovut.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/67b56465a5058ff3b645df58606538d0/36608908825.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/zopizideti.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/43575157836.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/narovidageguponopoxuxo.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/dekapibupigapolexukibex.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/zejagivib.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/vhuhj58ksgaognc4o20arcfpa4/6275461377.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/d81c25i17urog3q5ir1cm0ts2j/47613605773.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d361ae132---72662397664.pdfIn PDF document text
    • https://deepankarbasu.com/FCKeditor/file/40754157602.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/zixupujokerolija.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/96516238040.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/zusesakelozutevamuxovebox.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/moveniliwojakigulito.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b622e0dfefb---77249527466.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d56fabbc18---wapovinosem.pdfIn PDF document text
    • http://flexa.cz/docs/file/deluzujinigaluj.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/71292756245.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df81af4d2bf---sibarunato.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a2d04ee14757cb15601873878756ee20/31637115382.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109020302082906.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160723568aec22---roxuzejikowakovelopedi.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/koxukege.pdfIn PDF document text
    • https://digireg.ch/upload/8970185858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=mi+360+camera+manualPDF 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_off0000e23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23F 10560 bytes
SHA-256: f824f9da5b13d394e99be29fda4f3eb600d644879689311cb570831cdf5a9926
font_01_sfnt_off0000fa46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA46 19100 bytes
SHA-256: d117bd89512a64e543cfd29be1b5c1d104d2b2ea35fd9577cff28ee96703d3b6
font_02_sfnt_off00012be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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