Malicious PDF — malware analysis report

Static analysis result for SHA-256 af1b183f5b981474…

MALICIOUS

PDF

70.7 KB Created: 2021-09-24 13:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ef1a15e6c3ac3b1a5404e778e766188c SHA-1: 865413e13802fe6dce4f41d10264fabacd20cf94 SHA-256: af1b183f5b98147461a2ca858cf12f9f493330563706b3cb9c3fae3c521505c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm hosted on compromised websites, with a high ML classifier score and ClamAV detection confirming maliciousness. The embedded URLs likely serve as lures to phishing sites or downloaders for further malicious payloads. No scripts were extracted, but the PDF structure and URL patterns suggest an attempt to trick users into visiting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 6

  • 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.
  • 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://trunglam.vn/uploads/userfiles/file/ralexexixuni.pdf In PDF document text
    • http://www.childofafrica.org/media/userfiles/file/sivazo.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f358d3a1f3---50275572063.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16141a5d6e4067---xubin.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/37797351568.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/32118366826.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/cb623e773c1b70ecc8fe96b287417dad/68645114012.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/deruwowor.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed187b4da6---58325689961.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021921950374196.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/94478254920.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/zujimujiludutorogobixasew.pdfIn PDF document text
    • https://airbays.com/userfiles/file/98298664583.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/95407592256.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/jasajufisamomumoteve.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/wirujama.pdfIn PDF document text
    • http://snft.ro/media/file/dagatugororewuv.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/uh22h8f0bia16m9rreqrt56rp5/85928341286.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/sazemepodazolajazu.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/28218147328.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/wugetoniwafiru.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/perizelitepofu.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/betixebutavusevogemoxerel.pdfIn PDF document text
    • https://avenue102.com/uploads/file/48771997471.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/jawutigatobape.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/5256540933.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/veworufepimogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=chemistry+nelson+12+pdfPDF 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_off0000b6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D7 10916 bytes
SHA-256: 826fd2b1928032dce8a0a02c5d72b0f057add043e20f93c91159ac00c1721b43
font_01_sfnt_off0000d006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD006 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE818 14696 bytes
SHA-256: ba8af174171a48a1009fa5ecb9a7a49cafbed1ebada6889ff00d8e291bafeaf6

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