Malicious PDF — malware analysis report

Static analysis result for SHA-256 986889b7937048b3…

MALICIOUS

PDF

79.0 KB Created: 2021-09-16 10:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c4449da137aa8aa98c8998bac75f58f SHA-1: 4254b79128e75e65064f5dab033447de47167669 SHA-256: 986889b7937048b323247d74e8372acb43488092240cb0a8d30927d1a50a1b60
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. ClamAV and ML classifiers strongly indicate maliciousness. The presence of external URIs and link farms points towards an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://pixomot.ru/uplcv?utm_term=best+free+streaming+sites+2019
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161429f3c7c59d---kenovameposugojojubej.pdf
    • https://testagenda1.myagenda.cz/pictures/editor/files/dudaluwozeregefo.pdf
    • http://greece-ex.com/images/blog/file/60803263913.pdf
    • https://nasikampung.info/contents/files/gapegudik.pdf
    • http://metapolar.hu/tmp/zawutavutorokozopoburox.pdf
    • http://lactopad.com/uploads/files/lodaruvumasa.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/8h7sq2kai805i5pm6emfudesbs/pigalofux.pdf
    • https://next-engineering.com/userfiles/files/sozen.pdf
    • https://reha.bg/content/upload/file/68974887981.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130287d448ca---dodifuzozison.pdf
    • http://woodlandhills.ilovepokebar.com/uploads/files/96130331308.pdf
    • http://bassonconsulting.mc/userfiles/file/9133721803.pdf
    • http://podiummoda.ru/userfiles/file/64526418913.pdf
    • https://successalpha.team/upload/files/61859388567.pdf
    • https://soswzgierz.pl/web/uploads/files/73294005865.pdf
    • http://raylutickenterprises.com/userfiles/files/42288317203.pdf
    • http://fqcycpa.com/jingkelun/userfiles/files/20210911161641.pdf
    • http://dija.lv/public/userfiles/file/zafeligotuxufexepelu.pdf
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/juzalotapurazetezifuvej.pdf
    • https://vannordenvastgoed.nl/userfiles/file/75359554368.pdf
    • http://djk-winkel.de/images/uploads/file/jirakesavukulitavodaxura.pdf
    • https://doublehair.center/upload/ckfinder/files/21408476133.pdf
    • http://telegid.tv/userfiles/file/sakamikepevakuladez.pdf
    • http://jiangsutravel.kr/userfiles/files/20210909_230837.pdf
    • http://chi-kara.net/Upload/files/rawutowazewilu.pdf
    • http://laxycoffee.com/upload/files/25142001519.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_off0000d0a6.bin
c0719383e281670a8abcb1bcea98284f37c2c77447d1000fe8c3c24661c11518
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A6 17076 bytes
font_01_sfnt_off0000fce3.bin
04edf64e4a1129a3b0ba2547e101a0332b1c6624a6a92b092ebf3ecbfaebcd83
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE3 10904 bytes
font_02_sfnt_off0001164f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1164F 16792 bytes