Malicious PDF — malware analysis report

Static analysis result for SHA-256 1639510ec6c4d819…

MALICIOUS

PDF

84.2 KB Created: 2021-09-17 12:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a3bfaab356f2d2a899df03b14632c6f9 SHA-1: 97469d0a200426cd61364cdf56e97a0e4f8320d6 SHA-256: 1639510ec6c4d819b2fa0abed88cfec88e4ba177a137de328eed848d98a92fc4
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO manipulation scheme. The embedded URLs, while some are marked benign, contribute to the overall pattern of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://5thaveseniors.org/userfiles/file/kejolebugudibuxunewamewax.pdf In PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/87612262348.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/28170054847.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/detosubejusokos.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/pimoguritera.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/jubezewikuva.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614197e0ad1a1---89035747419.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/56526131015.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/65124099242.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/ovha87chddkll9k39dvigsf0h1/xivurizuxutusavatoxefefa.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/dinuletofipiga.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/goverifiguman.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/98649182022.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/44517808756.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/gazejujewoxepopipix.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/fenowufivakopadanob.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/92838132766.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/815720507.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/gifusikiw.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/sapozeset.pdfIn PDF document text
    • http://actinq.nl/upload/file/73403300645.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/f8c507ec6c72ec74fbdb44bf473503f0/52012446399.pdfIn PDF document text
    • http://sinners-party.de/media/file/84984310220.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/maligoxe.pdfIn PDF document text
    • http://decorstore.eu/upload/file/86995124605.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/3100df1739f185dbe623e974c17ec632/zowukurujofuxusudukozis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=ullu+mod+apk+updated+versionPDF 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_off0000e338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE338 17796 bytes
SHA-256: 2df8b09e5658c3c752fb2a04815449afa8ebf33ffd50e0d9ae6736b86ce7dec8
font_01_sfnt_off0001112f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12946 10820 bytes
SHA-256: 7cb2be06e2199c35bc1bd48913feb68e70c41b69224532e4f18d7e22608c0e05

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