Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5c5830a26a6dd7…

MALICIOUS

PDF

82.2 KB Created: 2021-09-04 18:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 33c4e38b69d34d568672943837cbd374 SHA-1: 3a47418492d5c8f4a6e2c18bc0136ba04e08d45a SHA-256: db5c5830a26a6dd794f213c35acdfc3ea81a2d61f8dddaba45fc809e26a513b0
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inter-travel.hu/_user/file/sobafuzulixudokeruvak.pdf In PDF document text
    • https://e-ceramika.pl/userfiles/file/dutukevatiwexutedoboxadom.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/32911744084.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb26345d8a---13241709129.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/vufidoxana.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/gabegavewosewuxif.pdfIn PDF document text
    • http://china-miyaco.com/img/file/20217411359.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/75358134761.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b80b1193---jeletosisoxe.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/demajorajadulagesamu.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a51baed45e---mewovuvixi.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/sebar.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/lsg55lbeh3lqsupd65v66tkpn5/16836694413.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd9df73188---58710449142.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/56699276565.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/31389011193.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/82020326055.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf48105eb3e---88755689817.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-3/20210503025346373520.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/putakivuxagotaxine.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/21827811787.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/1406035512609a592a0eaaf.pdfIn PDF document text
    • http://waypl.pl/upload/File/96354651547.pdfIn PDF document text
    • http://grandfiltr.com/files/file/5624553494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=osteotomies+around+the+knee+lobenhoffer+pdfPDF 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_off0000dc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC87 17236 bytes
SHA-256: efa39b44705af96cb1927559bb31a376e31baee5b3f2c3bb8dc5e016b52faac4
font_01_sfnt_off0001091e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12135 11120 bytes
SHA-256: 5832c26ee7704765e8c94a53e025526aeaca66e492b27bbec2a665773da85921

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