Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6bda91ec402a4c1…

MALICIOUS

PDF

82.3 KB Created: 2021-09-08 04:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9fec5516d1c45a8f556c25af712b5bd2 SHA-1: cc1362b9371c5c63f4462f7d3216491d41813227 SHA-256: e6bda91ec402a4c13fb35adcf587230f96ebd05035d9f7320517fdc0a0fca718
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The primary function appears to be directing users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=doing+quantitative+research+in+education+pdf
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92997408094.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/c909a6546e61594e9b855837d5ab6b90/fanatiribulanad.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/0e735b7b8abf3c867ce164c809f37f06/worevap.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/3kr1b14fn0jffg7u1evqltvoj4/71722477846.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/211011fa68d9ddc595880423a5954a26/karininapakativ.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff0ca702df---dupasemipipotijewaz.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160917d55b2955---dimijujixeradesoguzerubo.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ae82d8dd4f4---21597855772.pdf
    • http://www.centralperdana.com/file/xusekutu.pdf
    • http://mrsjamesirvine.com/clients/82887/File/98260746098.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16102c78b66698---juginuvafoxigogowiguge.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/pa0r235n8b990o5cffldn036rj/82848867759.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607259e93ab85---66874251323.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/3a238ce6ed697cc27c3f03b51b48eecc/86162578823.pdf
    • http://kartywspomnien.pl/uploads/assets/file/31211345125.pdf
    • http://prttour.ca/FileData/ckfinder/files/20210724_691B39C1C5C11FF4.pdf
    • http://world-housing.jp/ckfinder/userfiles/files/mubigim.pdf
    • http://ricarda-allegra.de/userfiles/file/supewevivitawevozuwop.pdf
    • http://studiotecnicobonoli.com/userfiles/files/bolijiju.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c52d7547b1c---zobuje.pdf
    • http://julianina.dk/upload/file/96277743688.pdf
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/67496358781.pdf
    • https://mps-india.com/userfiles/files/dawinewuzenu.pdf
    • http://paradisoseminatrici.it/userfiles/files/lebejamupumava.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_off0000dac8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC8 16792 bytes
font_01_sfnt_off0000f2da.bin
7ce96978e5ea10cf8acc94877b386657f9ffa272d471c0003bd908bfedb6679a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DA 18200 bytes
font_02_sfnt_off00012201.bin
83df3a5f6a495d7e12defc15505a40772ee89de366b42e99a14258cc762be0a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12201 11168 bytes