Malicious PDF — malware analysis report

Static analysis result for SHA-256 73bbef86b9c07dab…

MALICIOUS

PDF

83.9 KB Created: 2021-09-04 19:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a652e13987e4d82b467cb5bfca99d3d6 SHA-1: 715564c3337904d5bcd9739774eeeaf031c98cd1 SHA-256: 73bbef86b9c07dab7a0b12e22eaaab544ccc451497af7ce054efac6f9eaf1826
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution, disguised as a downloadable resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/9evr2mr0cp4g082sdspkvo26qg/42020611000.pdf In PDF document text
    • https://camelcarpet.org/d/files/60102586489.pdfIn PDF document text
    • http://mcutech.net/files/77885671233.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/fdh4vl4krobm259rgn67gs96uk/lukifinejidezirizobi.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfcb2410a6---57899891446.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/31891354154.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49eddc3f38---zelesoze.pdfIn PDF document text
    • https://anfauglir.com/images/file/ruwijuvusugejod.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/gabaxiri.pdfIn PDF document text
    • http://fitviewer.biz/files/file/57932286115.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/megakob.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/timovasifowimuzupenen.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/75932428412.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/ohg1j7n0rajd59ir4irk33htvt/63768216377.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210824230811_bik9pk.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/16529884702.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608558c116610---mupujetivotarebo.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abcf994c4ce---48022608521.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/wapevatebu.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a90d72a7aa4---vexedexiwumes.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/r6l1bprkfb536ertnr66kp8irn/31977250645.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/06e681fa1285494d79d0ad68109bda47/52852227859.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=photoshop+tutorials+ebook+pdf+free+downloadPDF 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_off0000e2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E8 17544 bytes
SHA-256: 6a42d88eb3aafef253c3469e4bbc39e7211b0aef13b41ff29dae85f6a938d73d
font_01_sfnt_off0001106a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12881 11016 bytes
SHA-256: c8460d8fedcde74bcfadfd4bf17292c6cafb3daf53ef56ee875aa5e6aae717c9