Malicious PDF — malware analysis report

Static analysis result for SHA-256 af6a86fbc3c2b558…

MALICIOUS

PDF

81.3 KB Created: 2021-09-09 07:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 7e2eb4dab8196b91f706d502c5751977 SHA-1: d3882763b7ab281fd953f1145f50f96b01508518 SHA-256: af6a86fbc3c2b5582c5aad1104076d579b3eabf7ede9023b3bd5f9fc2e29052c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to potentially compromised CMS upload storage, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URI patterns are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://philabc.ru/uplcv?utm_term=seven+streaming+online PDF link annotation
    • http://www.dilipprabhavalkar.com/images/file/62539255088.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/24683344151.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/55754165211.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/zovoxumajobetu.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/xozoxopum.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210905032647.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/lijifarubepagumopaxalotor.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/7726030741.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/rumukekikagonab.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/lavew.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b5cfcfbbe---58072037156.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/5544606987.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/renuxa.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/mikoxaxevisuzot.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133bc630a65c---pokusolugimezulaxukefet.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ad794187cc07f991b570ac7e1803205f/80918546896.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/vnv6d3gip24e44khsed85qnmfm/83818656032.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/55073943328.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/tiluboninosefof.pdfPDF link annotation
    • http://ankamet.com/userfiles/file/selokuwonowapejizupufu.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/zefazawobo.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/55572063324.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/15250501983.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/50655882265.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_off0000d972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD972 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF184 17728 bytes
SHA-256: fa5f45e661fb50b3a98c62a88e484e72c3bda263b812e05d951e4a11e19b03bb
font_02_sfnt_off00011f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F81 10592 bytes
SHA-256: 13f7ab96d8fd9dec08d298ce6257b0ef30fa8e74a55c183db96c6a9b53bed462