Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f6167dd9512ada3…

MALICIOUS

PDF

85.2 KB Created: 2021-08-17 20:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1f15d82f87a25dafcbbec4f059050bc SHA-1: fcf1bf48a11f2b524a175a8ee0a20849f0e634f8 SHA-256: 6f6167dd9512ada3a57935aeed134a7b67815941a18147c9c0fb936ea5bebe1d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm pointing to compromised CMS uploads and disposable hosting. The PDF contains links to external URLs, suggesting an attempt to redirect users to malicious sites for phishing or malware delivery. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/47502278343a4d07b1b532a55c510da1/kedarokoxe.pdf
    • http://sam-global.ch/files/file/70487843573.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16093f83b9d9df---95001271943.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/i9jvjp4c9oc58ilu4rua5rnkn3/51676520251.pdf
    • https://aydin-elektrik.com/resimler/files/26986817421.pdf
    • https://facades-et-traditions.com/actualites/file/95846777523.pdf
    • https://mttrasportisrl.it/dati/upload/file/47995374990.pdf
    • http://accessprecision.com/userfiles/file/26191400372.pdf
    • http://sys-svinding.dk/userfiles/file/rabug.pdf
    • https://delaneyllc.com/ckfinder/userfiles/files/pupajobabaxi.pdf
    • http://olympusflights.com/files/files/wudeluletisiref.pdf
    • https://bem-sa.com/img/file/dajoraxir.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a33457bf56d---muwemipemolowevepig.pdf
    • https://jxloanchien.com/style/postimage/file/wudinawexa.pdf
    • https://dildendilecevirievi.com/upload/ckfinder/files/35322872662.pdf
    • https://marathonroller.com/userfiles/files/dufov.pdf
    • https://bangprice.com/bangprice.com/beta/cms_image/file/38040250960.pdf
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/54786017816.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/xufonalimibod.pdf
    • https://jmtours.co/aym_image/files/pupugofopuvodopubuvox.pdf
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/19830787218.pdf
    • https://bd-sokolovska.eu/userfiles/file/39186731174.pdf
    • http://mywymc.com/userfiles/file/82597700740.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/3f8er0t1kgg23gfiu6ovs3pst2/11562196106.pdf
    • http://lg-palette.com/upload/files/gorijonufuvilaxusato.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/2810a2bffff9b20388711e7e5542e4b9/33869301576.pdf
    • https://muacash.com/webroot/img/files/29716759066.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=blue+book+pdf+free+download
    • 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_off0000e9d7.bin
b5447f94fc06c0880ffae2fb83c495e0f0adf985a143d157eaed0251042f19d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D7 10604 bytes
font_01_sfnt_off0001020c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1020C 16792 bytes
font_02_sfnt_off00011a1e.bin
d6c8f01ea99a4db908f04610f650d1e324edd7830874a72bd18f98b3cfb0c99b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1E 16688 bytes

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