Malicious PDF — malware analysis report

Static analysis result for SHA-256 6de10056d82d2382…

MALICIOUS

PDF

81.0 KB Created: 2021-08-25 22:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 109a7482596063436e40167386a7d917 SHA-1: 24eb7cd58c899ffa001f14af9e0705d6413bb12f SHA-256: 6de10056d82d23821b38ed51561b6109eded25eb74dd9774dc4d355ab61255cc
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised websites, likely intended to lure users into downloading further malicious content or submitting sensitive information. The presence of multiple external URIs and compromised CMS upload links strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pistant.ru/uplcv?utm_term=song+give+me+one+more+night
    • http://studioindelicato.com/userfiles/files/perusirebexowewoviwovotu.pdf
    • http://kemenyseprosiklos.hu/upload/file/19756871507.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed11a7a95b0---35384163738.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/45e0515a731e54b58c6246d4e6cd0f6f/jekupogajegutimezogiwoji.pdf
    • http://kiszelyugyvediiroda.hu/docs/file/88328436011.pdf
    • http://jrmhandling.nl/upload/file/20819514744.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/zujitumevufusu.pdf
    • http://www.yemany.com/yemfiles/files/52670646318.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/e0c59a4ee5e5d4ce45c228056f730579/39353222093.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/ahmpo6nl9alqbqahs3ajjdcmn6/delajenaliradamasafenida.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610ecc1584ea7---27791242572.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/9c3b2c544301ad423c9802c61ed5b73b/58172831397.pdf
    • http://automotiveenergy.cz/userfiles/file/60924342601.pdf
    • http://jatyn.cn/upfiles/202107/file/1626232927.pdf
    • https://aparcaderoshaddaichile.cl/uploads/images/files/44990301695.pdf
    • http://uteambio.com/upload/files/sapogawonibefukasekulabox.pdf
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/zuluwowagazixaf.pdf
    • http://krossi.ru/images/content/files/23255145411.pdf
    • http://vnndt.com/Images_upload/files/kujimu.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f71d142ab57---furobi.pdf
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/52063258329.pdf
    • http://ingenermarket.ru/userfiles/pajapidosi.pdf
    • http://broadgatecapital.com/userfiles/file/laxopidajodigotep.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_off0000db93.bin
fe992d528fd22e4422d2ed6966c636835b52d9bd4282685b136e93d408ddd6d6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB93 10320 bytes
font_01_sfnt_off0000f2b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B1 16792 bytes
font_02_sfnt_off00010ac3.bin
b6eabeaeabd3ef18e95ebacd9e2e74bd6447180031f16bc3a70b1c2db325514d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC3 17048 bytes