Malicious PDF — malware analysis report

Static analysis result for SHA-256 b029b25f20c306d4…

MALICIOUS

PDF

68.6 KB Created: 2021-09-16 13:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7c5d1ebbcfd4b9beaed771defa9ac3bd SHA-1: 09f4892a4e7714105f3ae7b57b48934ae35311bd SHA-256: b029b25f20c306d44e9f360d4d2fb5f516682fefcddca20d4f1d6a7d4a00640d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous links to potentially compromised websites and uses an image-only approach with a clickable action, typical of lures designed to trick users into downloading further malware or submitting credentials. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not meant for direct reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.kroonzuivel.nl/ckfinder/userfiles/files/mufoxaxexijobironite.pdf In PDF document text
    • http://gemmacapitalgroup.com/foto/file/loguteka.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/vadifaremewuzeritabalo.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328e3898fef---xesejezakapen.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/79455101645.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/0be2c5d95805d28563bfa46a5fc7e15e/24583978257.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/44598511519.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/65496131302.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/12972521394.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/48949730106.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/wunel.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/gakfihhihv265cgqkkhb8lihmd/figikovagalofamuxanujux.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/40905678468.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/ximeluvaforebegijalupomo.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109050716189489.pdfIn PDF document text
    • http://charivne.info/images/file/12862952410.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/3683288105.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/jisibumadawonodabakij.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/kozefibowifarud.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/12936260764.pdfIn PDF document text
    • https://icbacademy.com/upload/files/kasotuxinulitidenosigu.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/81649555327.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/rivaxepevakufep.pdfIn PDF document text
    • http://ijfbn.com/editor_up/kovoneboro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=insta+downloader+apk+free+downloadPDF 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_off0000b139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB139 14116 bytes
SHA-256: b446f86eb5deaf27343158b8d194754c10433cd0d44693007d329f98494b47a3
font_01_sfnt_off0000d3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F9 10528 bytes
SHA-256: e86d7f16c1ad5c326652e40d2194d058e51e5f14c0c49cedfd2c627893a8c9e4
font_02_sfnt_off0000ec29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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