Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6f7476a0553b536…

MALICIOUS

PDF

81.7 KB Created: 2021-09-10 10:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d98d36fa5eea941f8989188dbfb92634 SHA-1: 9da1b93056c6775bc9e8604279be5bbcd4cee177 SHA-256: d6f7476a0553b5360cc8b6788c84c28a1993576604318b1ea19ec724bb2ed298
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites or disposable hosting. The presence of 'utm_term' parameters suggests an attempt to track user engagement with lures like 'among us apk download free pets', indicating a phishing or scamming intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://allytemp.ru/uplcv?utm_term=among+us+apk+download+free+pets PDF link annotation
    • https://behbehaniprojects.com/uploads/files/66832328869.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/62915512050.pdfIn PDF document text
    • https://fobh.net/userfiles/files/bewitusabewoj.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/23900880635.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/tudirevoxegewotese.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/40837186650.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/siveparaped.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed95866e18---kejifewimurijexutuxu.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/tavukexisojexixi.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/58633132119.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0716715ef---wolizerovasutexafu.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/010901513510.pdfIn PDF document text
    • http://thongthien.vn/upload/files/28441375394.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/ninoluwikafowip.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/46891101578.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16136d346a1903---62696235973.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/68109210149.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/budosu.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021982249468407.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/vemiteg.pdfIn PDF document text
    • http://premiumdrinks.eu/userfiles/tikijiluxi.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/fimutirapira.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335d56e4166---bovitekodafapopapufibowe.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_off0000d87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87E 11008 bytes
SHA-256: 9657772472e09b7088b90a198ab582e89d82f8906ae549bb1be74fe5e6a42e68
font_01_sfnt_off0000f203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF203 18336 bytes
SHA-256: 97f7b995687fd6531710b7dd0d33676bb4f618283691c0404565db6dc12b5dd6
font_02_sfnt_off000121c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1