Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe408d1544713fb…

MALICIOUS

PDF

75.1 KB Created: 2021-09-09 19:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 25168c0c024a8c488c67a1b3ca79232e SHA-1: fb8f607705f1f32c2019878d41eeab8ff0cf6015 SHA-256: 4fe408d1544713fb1d5566e0f56037f2b56f82262b2322fb1c62fe94f37c53fe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple disposable hosting domains, indicating an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://occahomesearch.com/userfiles/files/defewotaxijapojorerifaxu.pdf In PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16137637783559---82272512128.pdfIn PDF document text
    • https://egf.tw/test2/images/file/45304258385.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/81517593065.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/jufupivibufofajufisaji.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f293b6d54---12454972593.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/tipidonabiforefajujidudu.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/betifero.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/1274206850.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/vapegatimawobewula.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109020513047386.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/58863996064.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/523ni0vmm82f968s2jjro7vvfl/majexakeludaludimal.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f69ef4b696---dosojerugodulefakima.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/92371414863.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/99820009267.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/konojinojokew.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/vodiruzigibigakutasusi.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/77073574864.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/7727091237.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/91928224299.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/79340217871.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=android+remove+ads+without+rootPDF 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_off0000c03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC03F 17576 bytes
SHA-256: 201def4d27298132a50ebf5416f9046aaf9d8365e3c937758cadd7cae4e0166a
font_01_sfnt_off0000ee44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE44 10700 bytes
SHA-256: a72d2e5fb24a27a2e487a8f6b27a2ddaf92b7147bf5ba3a0b3e77d970f26244c
font_02_sfnt_off000106b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.