Malicious PDF — malware analysis report

Static analysis result for SHA-256 b95d8d5320872d47…

MALICIOUS

PDF

76.4 KB Created: 2021-09-11 11:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8b5823764cdd6860ede51f8a6465455a SHA-1: 70fa88f932fae5e0d76721a412a596825e74a412 SHA-256: b95d8d5320872d47c5769a994c7aaf400433c323eadbbf61b8e49228a4c8fc1c
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs that point to various domains, many of which appear to be part of link farms or hosted on compromised WordPress sites. The document's structure and the presence of these URLs suggest an attempt to redirect users to malicious content or phishing pages, likely disguised as search results for a specific PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://laborke.ru/uplcv?utm_term=modern+systems+analysis+and+design+8th+edition+pdf+free PDF link annotation
    • http://schokoladenfontaene.de/idata/60485372046.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/fisonegifeduxep.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd03c9de92---21810158106.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/91432135206.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/32074359755.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/konojodilevuki.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/34268310855.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/talepokevofur.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/wunumifes.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210908185827.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/kipivegopewaj.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135913509823---79925808047.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c493debba7---38304922295.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/68533321269.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/37776580401.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/lusepadopujelo.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4321e4738---93923945791.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/82125897279.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161327c03aa55a---47998979032.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/59496626459.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_off0000c492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC492 11260 bytes
SHA-256: 8b14183b3e621bbf175ad860cb9968aa104775a8b505551735cb86609c9b4f70
font_01_sfnt_off0000de97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE97 17276 bytes
SHA-256: 9a26dd35da4f417c15d4c3ab55d465bd508a569eafb2ae0eac2ec8a92d7d02bd
font_02_sfnt_off00010bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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