Malicious PDF — malware analysis report

Static analysis result for SHA-256 684038c18497a7b6…

MALICIOUS

PDF

82.7 KB Created: 2021-09-04 12:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 38042f8e4314c0406838de25f72ef87d SHA-1: 345fbd7cd5a0a5d0b7307d5f02bbb5edfc5fb2ab SHA-256: 684038c18497a7b6f1d1292cd1cbb2da512c544f542a9dd4ed99d5efab802cc4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://anhopphat.com/uploads/files/99579139462.pdf In PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/21514157745.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/gupetuti.pdfIn PDF document text
    • http://getvisa.ru/images/File/sujironegaxeroxuga.pdfIn PDF document text
    • http://accronline.com/userfiles/file/38612766438.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2c1a0bde6---ziganuwiw.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/7d91a426df37808882bb1b11046ef20e/50575905474.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/dujogazapemugen.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/57297490149.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5417073495---dizamafelifif.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48fafa10c7---59276770090.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609038bf75770---wupunodigumopavekog.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/b4177d5c0698a60a252167f6eba95040/pidikotove.pdfIn PDF document text
    • https://novsport.com/content/File/29041796647.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/66610272330.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/6t6t69ehrd803p6fmkaefr44p2/76756583960.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1538a7f2f---zeribezazuwutukixi.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/41965630825.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/10062345740.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image//files/jakowutofasa.pdfIn PDF document text
    • http://thetownsendfamily.net/clients/a/ab/ab79602242cca8f930cd52af13df1d51/File/19989210765.pdfIn PDF document text
    • https://senhewood.com/d/files/76515808783.pdfIn PDF document text
    • https://telenovella-bg.com/files/rivimiwabipebodatemo.pdfIn PDF document text
    • http://ubest.ru/images/file/xawik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=pdf+split+windows+10PDF 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_off0000e18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99F 17320 bytes
SHA-256: 9035af6e6de3bad7d0c6b7349e1eaffa20fa852c9297cf8b531199de363cb704
font_02_sfnt_off00012604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12604 10356 bytes
SHA-256: 25c3462798dcf7d715c3abf0c8ee9fe88c962c35e57317e981a05f77f5e99225

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