Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a2bcdfb97eac85…

MALICIOUS

PDF

151.1 KB Created: 2021-07-30 20:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 92f9b08c9ac76da35da4f852edfc7bc6 SHA-1: 7fa7d4b29352a3cbbdb08cfd7fa97d5c74ac51eb SHA-256: b3a2bcdfb97eac85ff8622b51329b2dc71cd64685ee51377a22f8c3024c657f9
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other potentially malicious hosts. The primary goal appears to be directing users to external resources, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608775394892c---kamubekukugoxaratexozukim.pdf In PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/a2r2usuh88rl4kvv0m9ik6mnp4/38928110408.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105090759362397.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/41201736526.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/b07c3f23891d019224924e15b09ba7ec/bovosufibu.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/88988362759.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e0335b819---vurut.pdfIn PDF document text
    • http://amajyuku.com/files/files/12967962623.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/66ab35d52ac30fde116ba2b1b3769b1d/1048433233.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-7///2021727222504375.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/84703273318.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e858a23e8---69949017930.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/cfd108f0b7e72cbc8fc8a5b11d5a32c8/maxiduve.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/3e07b895d436cfd046e939a4ace84119/zikikukiguxosagofik.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/dojepinobolet.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/494fdb6564dba18383521f85059a1e4c/megibebefisuz.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/janod.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/bc77a527f8405d7e1500efa182e5671d/55633998497.pdfIn PDF document text
    • https://sabunwangi.com/contents//files/dositefuvuzomitogo.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cf4db2bffda---jegobodufaduti.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/87533969736.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3049c1be6---nodimifezamikajinu.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609fffdab7f9d---renapasaleledurasobazamiw.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/sutemabexepumadere.pdfIn PDF document text
    • http://ned.ru/uploads/files/71122478236.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=darwin%27s+first+theory+of+evolutionPDF 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_off0001ef5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EF5D 10712 bytes
SHA-256: 1cffed58c21e37f6327e7af532c1cddf569559b24f25aa5517c22d15fb4e3951
font_01_sfnt_off000207ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x207FF 18428 bytes
SHA-256: 5350149abc4db19d2ca163853272e89b4712b7625d890b03a0c76205c4ad9c09
font_02_sfnt_off0002368a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2368A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1