Malicious PDF — malware analysis report

Static analysis result for SHA-256 7859b34b8c644474…

MALICIOUS

PDF

78.1 KB Created: 2021-10-06 06:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a63111084f9ff33847256e26602f70bb SHA-1: 83664cb9fb0affbe7526667ba82a1b439197b59a SHA-256: 7859b34b8c644474abea76ac259d231dae9fba8c34a1c401cef5ecc5217cfd07
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://synerhu.ru/uplcv?utm_term=sweet+child+o+mine+mp3+download+free PDF link annotation
    • http://designklasse.de/ckfinder/userfiles/files/34142559497.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/dalagedi.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/6340752587.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/74113158243.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/92092019728.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613dccb2541db---navavujiseberijojebajubi.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/pitimaxowenarobujarugali.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/mozovavobudopalobuliji.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/29625845331.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143912be2bd2---jejovan.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/gawigowifaduniguboges.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/lurepikokovokofawafepa.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/boxabavikukakujul.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16153883057311---vamav.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/xataxomarumupiwagolemiwu.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/gawebepebejuwuweb.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/20485804018.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/85253717822.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/tuxurowutorevevefare.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1615a3397ec0f9---61131967054.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/xuzejomagevisag.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/dalinujotuwa.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/85664708255.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_off0000c70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70B 19340 bytes
SHA-256: 6f493b429f8276076686d4b7ea020a2747999df739021d684a9d801bbf24e652
font_01_sfnt_off0000f985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF985 11048 bytes
SHA-256: ee5c36cc281fd6b500cf78e37d2a83ae13a069b4cd0c878c4696e116e3cf1b69
font_02_sfnt_off00011316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11316 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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