Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5fce48d5018c32…

MALICIOUS

PDF

95.0 KB Created: 2021-06-30 22:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fc2a4b4497e761ef4d4b557717d0055a SHA-1: 44dc0d9562463d33f50f08e89f9ba5b2527fe8a7 SHA-256: af5fce48d5018c32d2f3fa0ff5c06eaef1034ad7ecd94e42021bea89221ffe83
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/h0n4ltgu18hhflpt548vgshnn5/21676585000.pdf In PDF document text
    • http://www.findvoters.com/userfiles/file/sadufutab.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/5ae32c0edd571e4be46a0b548ed01871/wepenopegomovonifa.pdfIn PDF document text
    • http://www.celso.org/download/zaxikuzalutiwobatubuv.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee091033c3---24702920546.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/tlusem9lknfaose2pn6f2uhp17/duvur.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/urtcoq3neq8r2lvjq5bbcq0kj2/19241148126.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/8debp4h7lf9d3jfnd91ui7h98j/supumiwob.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dbcd66a97---toluxojager.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb9d375e22---xonafumazotok.pdfIn PDF document text
    • https://yasacompany.com/upload/files/lededatu.pdfIn PDF document text
    • https://arerp.kr/data/file///demirojorirefodo.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608648c8e9f8b---41684187031.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/7f24632af36b85d40954986b1bd12702/96857468697.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/56168493665.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608683dc71d54---walaxegowuladus.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/jaxegitifer.pdfIn PDF document text
    • http://tencanpowder.com/d/files/luvafigatovizopitedubox.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/jinapikonomo.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608653df5146d---13645068588.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/71677223780.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/46386650287.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c14fc3ce7b---1406297125.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/bekivudufatikalazogu.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/14097731356.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/8637d9d483dedb0b91162651b7df2b48/95619031243.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=incorporate+meaning+in+teluguPDF 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_off0000ff71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF71 10600 bytes
SHA-256: 9d58e63e4e56d6ab4b554d2c10179937d18490d0affdedfa6b75f128dc1137db
font_01_sfnt_off0001179c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179C 23816 bytes
SHA-256: 843407d0b03a2e2032acfcdff9fd4534008d26b58289c055847512b0bddb592b
font_02_sfnt_off00015481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15481 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1