Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f3446bb770c58f…

MALICIOUS

PDF

79.3 KB Created: 2021-08-30 03:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af7284509d80a86b66c6ecc9edd9f03f SHA-1: 97b3f670e73319fb48fcfe3df90678a9ebabd76f SHA-256: 79f3446bb770c58f11dfdbac56bc916644d3585178a486ccb951a0a3f5624f7d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many hosted on compromised CMS upload directories, indicating a link farm designed to redirect users. The presence of embedded JavaScript, coupled with ML and ClamAV detections, strongly suggests malicious intent, likely for phishing or malware distribution. The document's structure and numerous links point towards an attempt to obscure the true destination and evade basic detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/41d7c3764b761af03da32989cf268645/60564333760.pdf
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/porolid.pdf
    • https://airflow-skateboards.com/userfiles/files/nokelipom.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/66cc94ca4579588a7a980408f6435f7a/89098948827.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace398f2542---12107298854.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610f0e3253e9c---mojagajuwexuvoxez.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160858836b4210---kusen.pdf
    • http://pokwuttibut.com/file_media/file_image/file/jeloladorera.pdf
    • https://palcev.ru/userfiles/file/18547516379.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e63430247---93830554764.pdf
    • http://absolutelyneon.com/userfiles/file/kutiperakozunog.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/488d7e86a51b1321da5d5c644ed9ba04/noxixajesufeganixeberuku.pdf
    • http://savvyais.com/userfiles/file/lafamaxuvomerine.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ef41e9dff---59943485729.pdf
    • http://eva.am/files/d19e6410333ccf4e.pdf
    • https://mongolia-volkslift.com/uploads/files/17715547085.pdf
    • http://ya-ke.cn/admin/upload/kotitudojit.pdf
    • http://geoman.cz/data/file/wixumuvotonozufifor.pdf
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/57697076662.pdf
    • http://orosweb.hu/ckfinder/userfiles/files/lufikujubejonex.pdf
    • http://porpora.eu/imagenes/imagenes_contenidos///99332431788.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/ba2dc162a7cf8a61d307ffd8ed39b486/43476179119.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160963b56888ab---dumusamudajewujabagezedo.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/360fd06d508be7bcfde9abac9fb99548/93861112195.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=butternut+squash+with
    • 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_off0000d176.bin
c04c6a3c9d67cea674de8707134a988c94b3328cd353636d3a09871b8741dc25
pdf-font-stream PDF embedded font (sfnt) at offset 0xD176 18060 bytes
font_01_sfnt_off0000feda.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDA 16792 bytes
font_02_sfnt_off000116f1.bin
47a5a30c7319da7804a5dc41d5fd14e8ea059f35db6624e5854caa549fa6b28c
pdf-font-stream PDF embedded font (sfnt) at offset 0x116F1 10424 bytes