Malicious PDF — malware analysis report

Static analysis result for SHA-256 837d0d2947d8a1fe…

MALICIOUS

PDF

75.6 KB Created: 2021-09-01 00:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d4f80a86782da5dcc42f3725ad411ee3 SHA-1: 95b7b11ba3b66e69fa4f4685e2bb9a2eb475bb96 SHA-256: 837d0d2947d8a1fe16283e842f411c259a62ee3ac2f76eb023ecada27aa0680e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or exploit vulnerabilities. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://exima.kr/userData/board/file/25656161939.pdf In PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f073e981117---gafoxapumiv.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/piguxajibigup.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/50274381578.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607aec6de5a34---95075739245.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/vusariv.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160cfafcf840aa---59914385586.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/jetinavabuwogubotemefenal.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/1eda5fcda20d608273b334999fbda563/92369316732.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16080efcaafba6---tafesunafawikar.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/32580400047.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/jezesixugikisunosilap.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/tojavutiziwower.pdfIn PDF document text
    • https://capecoralliving.com/media/file/66090410747.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/majonugusijogiwoki.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/52273330551.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/39285467717.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/18b2700d00f62de2cfd228c1eb51773a/52039094705.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/voom86a5gk1q2fokejnbclnre1/66274874451.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/2a3f0ba1fd6aceffb8ff183908103fc6/6564610719.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/ea4ub5lan4ud2ivf5ck1vk8fua/bunuxogetilisemedupikul.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/8b802a49de1d28936537a5d0777b845b/87706669264.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d06c0789599---tamikufaroseva.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/welejatopoxese.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/fisituwimuremoguxupox.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/wegewabaxopater.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=words+rhyming+with+3PDF 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_off0000c646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC646 10720 bytes
SHA-256: bbeab0f373caaf0514a1f8ac5f86ad1acde5bbbdc0e7784c8b6cc82a9254e21a
font_01_sfnt_off0000de96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A8 16100 bytes
SHA-256: 8fbd55cee160d62278bcfcb60259dc4d21ac2f6ce6e753c0de13552cbdf58e19