Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eb338489698cea5…

MALICIOUS

PDF

78.6 KB Created: 2021-09-05 17:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 261ca3c1df102191ca7856bddbb95d0f SHA-1: 2c44d0dbf42573397e6b6596b688278441a9e323 SHA-256: 2eb338489698cea50ce305bd5baf87b923242548cd3d90d5ec4ba62367f75159
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content. While no scripts were directly extracted, the nature of the links and the detection suggest an attempt to lure users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709beade3ab---89344438932.pdf In PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123a8f3e2d94---14281550834.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96311352e9---20584515147.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/nawudokomalu.pdfIn PDF document text
    • https://samowar.ch/upload/file/lijuzazafut.pdfIn PDF document text
    • https://architektor.ru/uploads/file/luwajidopamikodo.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/11938873850.pdfIn PDF document text
    • http://gestmase.com/media/images/file/83939597194.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/eaqsvvijma5ot6t06r4udn3lm0/60763269253.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1624176531.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/lesuj.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/30480913133.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608056720a8dc---42698927188.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ee12eb6ef---4509240811.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/26639317645.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/volefevi.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/54946807437.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/ladinokexowa.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/taniwuxikefofoxijis.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210726173733.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/fee534fa4766db2f5eef9a17b03927dc/16929395119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=computer+notes+for+primary+school+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_off0000ce31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE648 11132 bytes
SHA-256: 29c831028e8c4e033295c7ce6fe67031577e7d56592872f9121d89870eded27d
font_02_sfnt_off00010015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10015 17380 bytes
SHA-256: 4d41ab4d7bbce57a465824a2587806dfe67ca972845e56fc255b952fd8fb8259