Malicious PDF — malware analysis report

Static analysis result for SHA-256 a41027d531498fc9…

MALICIOUS

PDF

92.1 KB Created: 2021-06-29 02:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 324406b922e698511c812b9d05974400 SHA-1: 1906902e9c5b30259370b5e26b3cddb22c6afdf0 SHA-256: a41027d531498fc989cce111dfb28cec773713f4ba4940fa7083c53c87f96b18
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable domains. The document body is unreadable, but the presence of numerous external links and the overall detection profile strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://marty-triple-m.ch/inhalt/files/86605888508.pdf In PDF document text
    • https://mimpishio1bet.net/contents//files/vivol.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/fqr5752gohauufphl6qn5ube74/tawalibizasizigigudades.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b90402ac63---38361176822.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/zepanekezomipirom.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/70041949398.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/4191700192.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e31baa460---72725161336.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/616iru6c1bhkunclmciq5gagmd/pejejosamede.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/41668954172.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/vmp3gfi5d9gekqlcfd50lduq2m/nepoxonokezato.pdfIn PDF document text
    • http://orem.mn/uploads/files/50962778190.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084626e63580---15979560991.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d97690a29bf---87799181103.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/43061022524.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210626224428_964293367.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/sodarebasime.pdfIn PDF document text
    • http://wamer.org/userfiles/file/66608876449.pdfIn PDF document text
    • http://beiks.info/public/file/malibawajufuxezowiwoluv.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608989bd38dfa---vetijoxuwab.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081947683e75---giranov.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38f80f0707---13768432100.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8cc33d6a7---luragefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=a+discovery+of+witches+deborah+harkness+pdfPDF 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_off000104fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FB 16992 bytes
SHA-256: b645c7a584d9d814d524730d9460c78a5abdc136d5d1bbb927084b090c80dc31
font_01_sfnt_off00013112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13112 11148 bytes
SHA-256: 355de3ab31b77a78c7e5ef241871305354890cb1f9e9d23aac51b479898d3612
font_02_sfnt_off00014b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1