Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8bd73047b504983…

MALICIOUS

PDF

89.7 KB Created: 2021-07-25 22:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 018400463a13f2fba54e8a36f779b8e4 SHA-1: 6360d850d3a73e118aa55e549a14bbdabfc6ed8b SHA-256: e8bd73047b5049835f7b6ec32fa44813051897bf5a87970502c74fb2dd4c3f6a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute traffic to potentially malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/tbu3iengfm1kt3hole99ldlfi4/xifilukagemesamosejin.pdf In PDF document text
    • https://springkasteelhuren.be/userfiles/file/ponofodafinapuxizoxa.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a25906bccef---13710676697.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5c197523c---87195150301.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ntcs08pmimbs4fvav6joj4fo40/zanemuwenikokejowimadale.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/b231e57fe00c749b7bfbd589a498b239/lerivogijifewadekefawo.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/924bc5089a871372ecbbebb4492336b0/xudijemobavi.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/68299194980.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/tujedofaxobatugu.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160abfab67cf20---boxumokega.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/86851183914.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/46208293293.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b8549c3e4---36858143650.pdfIn PDF document text
    • https://ebooksweb.net/files/file/rutunexu.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/ridakavanuvogekofanexa.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/iscp6cjd3t1213utnbl44n6072/66445333061.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6eb33531ea---limigoxijap.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/a2b8f6d3761cabcf961ede400b83b8d1/tevapavifuxeledun.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/00e4499a786ef802f6a7cc3eb6c926db/13073111463.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/24371272461.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3cb16698b---98255808868.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/uah3hvqpev5v94lb15ic0q5q7r/goraliviridixopikerowib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=automatic+car+driving+tips+for+beginners+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081242f09ae3---sojoveledatolubig.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_off0000fb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11344 16684 bytes
SHA-256: 2c5cae467f443beac02a6ade60bdf1839c798589571b19bc67903b8fcb4d19af
font_02_sfnt_off00013eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EEF 11204 bytes
SHA-256: 1a57bc2e48a7149669d00d4a5531f14fd0a7129ae81f0340587a940a8a77c133

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