Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b7506a1a79c452…

MALICIOUS

PDF

90.1 KB Created: 2021-07-05 20:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b26316ca5c1b37be5d15d23ec0d0c523 SHA-1: ca31a277291abd1d14769e6f3349a6bf1990062f SHA-256: a0b7506a1a79c45295e696773ec28b1081ae9d77bafa39effa0f71a1f84d5ab3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external URIs, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute malicious content or phish users. No scripts were extracted, but the nature of the URLs indicates a likely intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://huntic.ru/uplcv?utm_term=oxalate+rich+foods+to+avoid PDF link annotation
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072be9b15a54---juvetiwetikul.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/10128785597.pdfIn PDF document text
    • http://oinworkshop.com/clients/6/6d/6d9161a7191ba42f41383a85782e2f4f/File/bavebimofiwijakiwox.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/5eb46f785bd8e605300bb4ee4d750a2c/xewotimeped.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/dfc8390b57adcad2f47ca9c0514a6198/xofanazitiroradukavixara.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/0d4833f98e4bf54db4a74867837c739d/konegututasibiwi.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/jatuvoguvaxamiliborom.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859123e4d52---67294644311.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-1/20210601141141590342.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d8183857456---87395444856.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072d329cbf82---xixalobepaxesepejomuzuna.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/30706760783.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/56332106777.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/440878f32350a956440e5027cefa6b75/48164908779.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607dca098c569---tamokukuzej.pdfIn PDF document text
    • http://stasta.com/userfiles/file/81063038244.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/21184450219.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e188680a914---lenamuworizifixatabulokag.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/ralumirubaliwida.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/64013351433.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/lameruzilupuxozogexe.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987974d743b---73081662720.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/pelodotiwodedabomesap.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/55013216658.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c393ab1b71b---99661007539.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/t32d694r2fjs4cjk2df1ag8apj/seduzipodav.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_off0000fdd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD0 17144 bytes
SHA-256: a2dbed69c9c44ee976f9377ab6861efec7063258209c2709f0c4a985a8789030
font_01_sfnt_off00012a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A74 10660 bytes
SHA-256: 86c36b9ce2761b12eeaaf343cb333714778ca0e0f7dab284aa5c0c12e138274a
font_02_sfnt_off0001431b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1431B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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