Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce31d359420c6b35…

MALICIOUS

PDF

72.0 KB Created: 2021-09-05 17:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a0d18736f32fa1c2aebd19ba729b0551 SHA-1: 3fe84bca1ef91e92c6baf587cfd0969aac94d6d6 SHA-256: ce31d359420c6b35f549de20da7a273ffad447fa7a2730de8ea15e39993ea226
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external URLs, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded links and the nature of the heuristics suggest it acts as a lure, likely directing users to download further malicious content or provide sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cherryontop.pl/upload/fotki/file/30010272285.pdf In PDF document text
    • http://houselandia.ru/files/gowejekelip.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9c1a249e4---38058212652.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/kexibejunupuwagax.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210615_220712.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/50792200317.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/1e711af3b0b138d3c0547f5d06a1fd08/nibakopidijowasuxab.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/xojogag.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160876d624b57f---fureraponifepososeti.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/81822727115.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dbe14c12f---kezebagifanopesifavipefu.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/letijumofefu.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e23cf48b21a---69192695271.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/afca8719930856af0f89d7e8c7fecd62/42091109560.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/14882321809.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/86258008763.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/gebedepepagisugi.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608722ab47082---digog.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/14451081033.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/l8k5ie550c8jqao8rlrlb6t9l5/debexifuxijujijive.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/gefegapenolagitumuzixajuv.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc62a15082---5586787136.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/suxutipexufebigogakof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=oh+come+all+ye+faithful+piano+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_off0000bacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBACF 15092 bytes
SHA-256: 7ee2f6e26f19b546a4a70bb73a687c9ded14c92026f63cd84128dfc5c83340bd
font_01_sfnt_off0000e128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE128 10856 bytes
SHA-256: 7ab0ff6f4bdf87e018c76f4a5fe0b5c8618b508ad66694492328203078b2bbfc
font_02_sfnt_off0000fa12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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