Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe7ba70d85c6f46e…

MALICIOUS

PDF

89.2 KB Created: 2021-08-12 14:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 40ea767b7eb1a98a1e079f91fab98edf SHA-1: 678a7f597a84f75fc1e173c1bf3fbf7b489c48e6 SHA-256: fe7ba70d85c6f46e0d7d9d70c8cd914b83951adfc0c67590fb59ed819fbb1c5a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload storage or are part of a link farm on disposable hosting. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://przychodnia-felinskiego.pl/uploads/editor/file/88693698111.pdf In PDF document text
    • https://yalcinplayer.com/calisma2/files/uploads/tidolowopibifoluriso.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/78048803024.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/newokumip.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/ac1a84bb581e5e7071a37f31b6ef76e7/84966609254.pdfIn PDF document text
    • https://unosms.us/userfiles/file/121320681.pdfIn PDF document text
    • https://topjobsnepal.com/ckfinder/userfiles/files/tinaxuwusuzejopokes.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/sogilefupugus.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/genet.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/04374fb471b0b11ee25c2455f603a269/beginusimoxexi.pdfIn PDF document text
    • http://bakoca.hu/files/file/ponevolulopetoxode.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/704e1b7c41c654ea8e55d4028efc511d/tedewux.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/51685787093.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/98605459544.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/10291293b5df5679d41c5b1b8d578661/38959136585.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/4e7f9a4c8c58c8b8f6df3eb8367dd163/27752148604.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210630100035.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7c518aafd---lamaxagixamumavupajoxanu.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16074f820c03da---98670297790.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a3686b0580e---63537042998.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/xadedewuxigalodudaxugaxa.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/13784581240.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/3588f52f97d83ff541a92f30d01fd57a/8648146390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=dake+bible+commentary+appPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11092 10712 bytes
SHA-256: 92bbaa8fb3ecf5aa7a54d8aea59143cf16e77a92dd23abe3d76cfbc2cfe7a40d
font_02_sfnt_off000128f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F1 17588 bytes
SHA-256: 7af599f83cdb1f6b0de88f254474abfd144b0e902e378f2a7ada6f34e8a09ffe

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