Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1065bbc7308089a…

MALICIOUS

PDF

67.7 KB Created: 2021-09-17 13:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ecc9aa4668328e87df7eb4a7e66a3aab SHA-1: 91cc05df42622ab359c4818fd79acfc6e7009753 SHA-256: f1065bbc7308089a5dcb960c64ea10efc9deaebab7b76fc5cd93086ef08eb0f0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous embedded links pointing to potentially compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The document's structure, with minimal text and a focus on images, further supports its use as a deceptive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • 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 67 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.
  • 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=just+friends+full+movie+eng+sub
    • https://sibservis.com/ckfinder/userfiles/files/nepusizomamanekibowem.pdf
    • https://finliz.lt/i/File/10584415499.pdf
    • http://diagnosticaedilizia.com/userfiles/files/28608323666.pdf
    • https://pointvirgule.ca/upload/editor/file/3585159484.pdf
    • http://www.physedu.in/newsite/userfiles/files/58908627856.pdf
    • http://cungcapluonech.com/upload/files/85613005684.pdf
    • http://hiredriver.com/uploads/assets/files/78975059276.pdf
    • https://www.hsbofmn.com/ckfinder/userfiles/files/lupovekapezulifixufuk.pdf
    • http://101balkon.ru/upload/files/bakimilobawadure.pdf
    • http://csim.jp/ckeditor/uploads/files/95898115863.pdf
    • https://www.institutvzdelavani.cz/files/94982286820.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/h28jj7k7rb12sjvkbbfgt6i170/1517737767.pdf
    • http://bdsductri.com/upload/files/xixogojurovapipafiliso.pdf
    • http://www.eatvirukai.lt/uploads/files/lejutedoza.pdf
    • http://immobilieninvestors.de/userfiles/file/28816188614.pdf
    • https://nazrabilisim.com/calisma2/files/uploads/78903634741.pdf
    • http://ageofwonders.buka.ru/sadm_files/40441335145.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/ea96f1e687ea39cb98d97efcc2ace9de/kedixivamutan.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/bd2f478d685d2a0bea4dc8926cd49038/jifalupozedunawi.pdf
    • http://royalwedding.jp/images/blog/file/8150443600.pdf
    • http://fese.in/ienupdimages/images/files/gufaraz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae77.bin
89ff0ae1d20e29fd10976895c7befcdee4a7fba0a12ed3447a29c921bf4ed534
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE77 13776 bytes
font_01_sfnt_off0000d075.bin
2c6d9a57f5069e6858fab4890a8962553c8c79b90730ac91deee307063aaa6e0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD075 10832 bytes
font_02_sfnt_off0000e946.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE946 16792 bytes