Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b73ae96d87a0e9…

MALICIOUS

PDF

80.1 KB Created: 2021-09-17 08:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3882938276b047f1640c47ef6a843baf SHA-1: e70579a2e179801fa0a337187d8ae1914fbc04c6 SHA-256: 75b73ae96d87a0e9e7b6b1e36bc53c70f5450cf4d59671965333dfaa0c974395
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. This suggests the document's primary purpose is to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://321eastern-thailand.com/userfiles/files/66719510990.pdf In PDF document text
    • http://vector-mebel.ru/uploads/files/sesigugububeloxuge.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/dogafowajalugatubuwov.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/lasugiriwedofurazuv.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/79357710003.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/67351419530.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/10943859782.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/sixokitixofumotej.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/9571685453.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/fekopowitebetogosivozim.pdfIn PDF document text
    • http://tzsunup.com/upload/molasuvuxe.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/tarunovarafemorujupuwu.pdfIn PDF document text
    • http://domexpo.ru/up/file/gibuxunu.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/faliwoxeful.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/e580215e5a6fcd73bc0b2c1cdc507f16/89060874911.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/66578930987.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/ganikikafokuvegizovepizof.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/52150550714.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135273680d3c---kifeletef.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161410d95392b6---71089743508.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/metesokesogezafebef.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/17279523470.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/lulututuwori.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210913_FD34CBB123CA25B1.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=betternet+premium+mod+apkPDF 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_off0000d54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54B 17404 bytes
SHA-256: 292413ee09c6cc489e75579397093415e74146a76714681f82b5f8e673748a3a
font_01_sfnt_off00010219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10219 10584 bytes
SHA-256: a26cf3f072aec3dd9fcdb2c66bf04a130f1104512365f02c71739d4bfe86051c
font_02_sfnt_off00011a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1