Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bacac4bf9eaa224…

MALICIOUS

PDF

84.4 KB Created: 2021-09-05 00:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d1ca9ebd1825944c2a2e2b9768a1409a SHA-1: 795eee04d651ff33c6f349f88b57d65b5b7df4bc SHA-256: 9bacac4bf9eaa224e82ae48bdf378029550291fb5af16620a16d94e0bd840a60
236 Risk Score

Malware Insights

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

This PDF is flagged as malicious by ML classifiers and ClamAV, and exhibits characteristics of a credential phishing lure impersonating Microsoft. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, designed to lead the user to a fake login page. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may also instruct users to open a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://catamma.ru/uplcv?utm_term=unprotect+worksheet+online.
  • 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://catamma.ru/uplcv?utm_term=unprotect+worksheet+online PDF link annotation
    • http://debseven.net/UserFiles/File/favaloxegadumilawiwugu.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/dokoxipirarodabodawuzal.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091574b61681---pisizidotagovavurasojex.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/zokugujimoxukat.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/48098083872.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f891311ea7---84796157703.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/zutexare.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/58955831059.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbce9ef74d---nusilaperituravij.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/metisujivunel.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ed4cb44f7---funodevagofonoxanas.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/botovu.pdfIn PDF document text
    • http://hasyo.net/files/file/bubutosiramabawi.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/10849c426c39676de07c71b81060134e/ragulik.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/6d157b8bd9fbadd62797ea3adab977b9/mozibekefevatanelafire.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/83257385313.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608527ae2f2e3---zijaluk.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/9q39phrh6qjvmto4r3jfvcs53u/kedabarakemajununa.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/74191724674.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/183cd6a85fbc61570f49c53e57fd5c34/baxupapalilutogizuwugi.pdfIn PDF document text
    • http://danfilenemd.com/clients/67744/File/lodegapoji.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/85893947698.pdfIn PDF document text
    • https://wittnebel.dk/file/gakorawexetuxo.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_off0000e0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A4 19692 bytes
SHA-256: fcc05e24ded42204fc57633792b41cda60c0416b6a342078f7301812e018e9f5
font_01_sfnt_off0001140a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140A 10496 bytes
SHA-256: bdbee89f93c4233f29ba08bdf6b4005838731a3336c2bfd4b4d6f5051f76a4ad
font_02_sfnt_off00012be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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