Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5621f14e451f822…

MALICIOUS

PDF

79.0 KB Created: 2021-08-28 22:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5455a998933ca4240e9ff40b7a963f2b SHA-1: 5f2e0df7cb65753e4d2cc32406b6c990c7c09873 SHA-256: b5621f14e451f8229af0e5f80203433e2bd70d5d32ecacef4c27bf6bd9020927
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating a strong intent to redirect users to malicious websites. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan. The document's structure suggests it is designed to host a collection of links, likely to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://synerhu.ru/uplcv?utm_term=how+to+see+unfollowed+you+on+instagram PDF link annotation
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf30f406c45---gugujozap.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/45aa6433d60be00c47db9425ba8dac94/bepopodagoratima.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/52f8dcaaf2b50820b2018f6526bd8a89/48897533100.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/81857809910.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/2lrre5c46262p94nhhnnoemj97/xovizokalorifaxaxojow.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/83881643778.pdfIn PDF document text
    • http://usmleworkout.com/files/file/16536285981.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/55b644b56c0e00f57081daacdfa2cd75/62919459853.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/f589acb34ddc00d1bf1d7faeb4f92c98/nabesegufop.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608134c3a8e19---20930447727.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/53062921246.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/86909584485.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/74684069068.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210501001914371576392.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/femutol.pdfIn PDF document text
    • https://atl-50.com/files/file/24778011376.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/68826417593.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/33320686658.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/ptkikeptj1tuos1q62ho341it1/jizor.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/bifebojiwasovexipo.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607375aa898e8---19442814190.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/e62cmrackm064of2mj7urqqddq/17270629272.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/14432417621.pdfIn PDF document text
    • http://uamarkets.com/images/file/52177014269.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/18700294984.pdfIn PDF document text
    • 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_off0000d222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA34 16464 bytes
SHA-256: 60ba94151018b061d4c260c1cbe63928885a39d32035ac4419227459dc5fa898
font_02_sfnt_off000114d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D7 10988 bytes
SHA-256: 1a290049aa98fb65b2f229368417322d490e66d2fe172ecbe766f4ce047556d7

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