Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39c7a0ef54a4f0c…

MALICIOUS

PDF

73.2 KB Created: 2021-09-09 12:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f86c6402c26ca008d5c08814d258961f SHA-1: a46b97a001c4b821ac63f87dd338795f3a56d313 SHA-256: c39c7a0ef54a4f0c07576311e73355a036fc1a7a96cb37f1f9b9a432b8bdb089
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, indicating a high likelihood of malicious intent. 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 structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://www.anjhimayath.com/upload/file/26484883086.pdf In PDF document text
    • http://ekopaczka.pl/imgbrama/files/45351215537.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/kokoparedevovemasimiteg.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/belejuteb.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/11950060812.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132a3fe5fcb3---38209780042.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/lijijefuladudunoxileguk.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/tosewixibusonetag.pdfIn PDF document text
    • https://venus-forever.com/image/files/17527256137.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210907065540.pdfIn PDF document text
    • http://trivio.it/userfiles/files/lokupekopudoluses.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/61466590406.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/wusifovomijutopalu.pdfIn PDF document text
    • http://intertravel.hu/_user/file/37304982707.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/sisowa.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/kovutakimufedaj.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/12776055274.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161341851787a2---jolosupojupag.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/nodijizodidufi.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/96831762865.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/mezorepub.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139459012b61---tuwadake.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/68732843223.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/4631336892.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613956a2d2fe5---87588427116.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/rodarosotoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=call+recorder+xiaomi+note+9+proPDF 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_off0000ba61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA61 16860 bytes
SHA-256: 35f6deb7358a0f0ad804df134f57c9d9ad391bc15984ec1acc0d687981cc0c70
font_01_sfnt_off0000e5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCB 10808 bytes
SHA-256: 39dba7ae6245461b900453d854fd2cab5c565ae5ea7c94638662410ba5e37fba

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