Malicious PDF — malware analysis report

Static analysis result for SHA-256 f992da73432fda09…

MALICIOUS

PDF

84.7 KB Created: 2021-09-19 19:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cf3a7bb60999f127ed98f8a15dd95b57 SHA-1: e89e7780e7943184c6f64b6a4d714ec1f3603284 SHA-256: f992da73432fda094401297e0d9520dd1eae12cc7ac787a0a5df4992c44d95f6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination or distribute payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://charlesstreetvideo.com/userfiles/file/54106616189.pdf In PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/577956cc118e3cc2c5a29cdad1188aed/xokixebatasenifeto.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613799c53ce09---73173051443.pdfIn PDF document text
    • http://yuli-china.ru/d/files/vegofiwibed.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137819ac6a8d---xawagudotivaxurazotuvivox.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/bovolubebafe.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/39889865360.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/95473463849.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/niwulomujurofezunatuguz.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/mokunaxikaruraripu.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/14627121420.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/giguvilakakazajezesor.pdfIn PDF document text
    • https://subarini.ro/mm/file/15888100375.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/padazoxunokabatezarefi.pdfIn PDF document text
    • http://strandedtattoo.com/file/woros.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/gutonafelebibusisifeti.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/84391291970.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/11363442527.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/jugugidi.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/2057877930.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/livebagonud.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a059c1c888---27365160875.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/32468608515.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/43999707335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=software+for+htc+sensationPDF 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_off0000e64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64E 10548 bytes
SHA-256: 3f0894caba9f8019af2c905c94c197068f0f7a598ad4524db4bb8650a1533b49
font_01_sfnt_off0000fe5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001166e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166E 17992 bytes
SHA-256: 06c21a02b7a37b9e2b831c0f2f7d957ce6edebf08942535fef4659104d6ee96b

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