Malicious PDF — malware analysis report

Static analysis result for SHA-256 a97bfb5b5508219c…

MALICIOUS

PDF

83.2 KB Created: 2021-08-24 03:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a58b927691275fa38c7ca14a5bca02cc SHA-1: f0abaa8d840b9d08b64da956e1d62402ab9ad953 SHA-256: a97bfb5b5508219c96eb1a1d170334546b13cf8ad7582a382f84dec9edd8f216
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The document contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload directories, forming a link farm. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://coretry.ru/uplcv?utm_term=fahrenheit+451+part+1+questions+and+answers PDF link annotation
    • https://bayihoki99.com/contents/files/rotolupizopoguxuma.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/18318429797.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160921d35b54fe---kejogijopinamon.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/gimuzinubodogodadozij.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4654c82307---lidogup.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/vowijewepak.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210819_12A06796D0630591.pdfIn PDF document text
    • http://idroter.org/userfiles/files/34771462571.pdfIn PDF document text
    • http://bvsaigonbinhduong.vn/uploads/files/volofanuwonaruve.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/47134118824.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/92555315879.pdfIn PDF document text
    • https://genegurumiraclehealer.comuserfiles/file/81291154731.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/5dso8com1rj77jrctgrfeg13s1/78806995081.pdfIn PDF document text
    • http://bakoca.hu/files/file/68268820694.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/dosazufejujedawum.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/df647b84275a50623f3b59d9e007417c/zonomidadufivazat.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/74829072557.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f58c3efc7---kawipebuxovimafedu.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/fusepafesipub.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/75022587321.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/t0o9g6hnmauou399osja1o0gs0/ripojopuridorujafis.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/temaxusojosir.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_off0000e12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12E 11016 bytes
SHA-256: 995fc938ebef8636cbf96214f5108e40b339decd5cd2d5ba77069ad8f7949441
font_01_sfnt_off0000faad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAD 17140 bytes
SHA-256: 893b8fbcabfb48d1aea1374484f6041d06bab59b2adad0ff9b835320553140ff
font_02_sfnt_off00012796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12796 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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