Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b4ab9b5072d0063…

MALICIOUS

PDF

85.0 KB Created: 2021-09-05 12:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2aa228f79f36f8307b1b5259abd2dd23 SHA-1: d28a5739586f933d8772d9153a5b6fb102fd56c6 SHA-256: 2b4ab9b5072d00635237efddec6647b78a6932f626950c232f936c49a9c742e4
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. This suggests an attempt to lure users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://asiadomainstore.com/userfiles/file/fomelesafofumunolob.pdf In PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/likare.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160702f6eca0a4---88421140945.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/wadenu.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/161058be9e032d---dunomuzinalufavi.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/f4nts2tbipdv6g3do7tu705fo4/93172268503.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/97844859032.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cec278c849---207156005.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784a2c09d6f---16535348720.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/51c299c95432c3408be7969124854b36/joxaloxabaxifuxera.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/fadotofunufenibiwuz.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/kiloxurerenusetorugoben.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/vebediroro.pdfIn PDF document text
    • http://udclassof1968.com/clients/74076/File/pabidozoresiliweroli.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/nolasexikunagabotoloroxu.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/800c226a2905b7d6c3351257e3a40a7c/pukazevurinu.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/179c907ff5b192f8240fd064333b0f65/3275182897.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/86592113828.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1625056143.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/45407203449.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vg7h6o7u4li3f5j153jf5lc794/96266322320.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e5fb8c42c87---pofoloxawod.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/89570973951.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=percentiles+for+grouped+data+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_off0000e649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE649 17760 bytes
SHA-256: e771e6d35a35054d74709692f42cf5ca7f8f70d1a3edf196567445fec22fe696
font_01_sfnt_off000114f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0A 10896 bytes
SHA-256: 051a00a47b49e04d5e082bfb5d52ca68cfa133e20299f070f54312ba022ef150

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