Malicious PDF — malware analysis report

Static analysis result for SHA-256 f016f7946007fb23…

MALICIOUS

PDF

70.3 KB Created: 2021-09-18 12:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7e443ba4873d0a23bb9919dc1865d8b1 SHA-1: a7cdca805b2d58dc32b08183256686d2db2b1220 SHA-256: f016f7946007fb237fcfb55fb22692301d2bc51d7a14739d37377e255222f1a2
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The presence of multiple PDF-specific heuristics related to URI and link farms reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://dreamscar.eu/userfiles/file/nesigatuva.pdf In PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/a53426a612ea7ccec59d84b9d927dbab/zizujuwuloxajagizolituzuv.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/wewimoboroxofowaxuguka.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/88865233096.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/rugikiwevatolozajig.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/lolinid.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/11917759411.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109110450223425.pdfIn PDF document text
    • https://samowar.ch/upload/file/pabobolipipewokatonogase.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1b65137be---4171158487.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/xidakosunobimozasojo.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/naxugefuwokujujoxapizux.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/dudisafopobefadak.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/tmv7al5laaedqg29je6mgmqp9j/26843346847.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/tisegukimilavesefinamuj.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/virowotikide.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/jazugigaxovepul.pdfIn PDF document text
    • http://i-physiology.ru/upload/vorixil.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/92600995917.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/10165443776.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/pelapojakuwogelanuviz.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/tezuzefenuperepere.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138ffaa58a4f---27931692399.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=a+quiet+place+2+tamil+movie+download+in+isaiminiPDF 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_off0000b429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB429 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3B 14880 bytes
SHA-256: 33e50e2354cbfe34bd7b0c063be941e94e9b0a17fc42f34db90ebd75dfecdeca
font_02_sfnt_off0000f152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF152 11076 bytes
SHA-256: 70c1e0bad9a4fd125c058a8c0e0000e19fa81b95708c519a8c8a2117255275b8

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