Malicious PDF — malware analysis report

Static analysis result for SHA-256 b281b155ec325702…

MALICIOUS

PDF

76.7 KB Created: 2021-09-20 02:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0ec95ddee4ab96c80449cd65b9bdfbf3 SHA-1: 6a881e9ccf86601fb2d3e99b26f21d9cec961a92 SHA-256: b281b155ec3257025a0bd8f4926d82ce52d79d69a822d69b2c0f8b763860be60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://medvor.ru/uplcv?utm_term=rupaul%27s+drag+race+down+under+watch+online PDF link annotation
    • http://broadviewlibrary.org/uploaded_bvlib/file/fefiraligoz.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///xewilu.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/29213857134.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/bozolobesijuba.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/zoperesir.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/1497325964.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/73591950982.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/bamonuturefawunasa.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/sevoromef.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/goxudi.pdfIn PDF document text
    • https://schmitz.cz/res/file/78755749990.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/piseniwebor.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109160134558479.pdfIn PDF document text
    • https://ceylinpin.com/calisma2/files/uploads/gikorusaxi.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ea4518029---38587379488.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/fe449d88ee8459028d481cc8ab4bdf6a/9827157532.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/buwomosonugidupenakegi.pdfIn PDF document text
    • http://cncsprings.com/d/files/41266836711.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/b869a56dd09648b2db271ce8740c7545/jorixezakogosugubam.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/jiwofujupivuvemalav.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/gadegenikap.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16143a2f88ec5c---nododavumelukutizi.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161321da8ad7ac---35925950987.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/dalalazalu.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/mufupugedet.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/75579523979.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_off0000c4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A7 11060 bytes
SHA-256: e65955f7db52648e186a7ab4726531d99bd619bc329bac3c2c3416d16b540b9f
font_01_sfnt_off0000de36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE36 17684 bytes
SHA-256: c9000f62b2805ccc197653a22f9c5a460ff0fab11dc5587ce5a2a7f0de0f7e3e
font_02_sfnt_off00010c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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