Malicious PDF — malware analysis report

Static analysis result for SHA-256 eac1723242f847a9…

MALICIOUS

PDF

115.4 KB Created: 2021-07-24 21:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b88c91190d813306c65ec285e0e6df2f SHA-1: 450f6c95b9a9f690494bc7cb19ab249524a910e8 SHA-256: eac1723242f847a9cfe5b64ae07a5067cf714ada42c4490a23dbb83bce7d0cf8
156 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. The document functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/j0mdfsrbt1pe0rgjgp7cr0sbg5/sabenejodeg.pdf In PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d47ea24bd---66734308192.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/tv6s6bcbr7c0f9rss9as8le2he/40239740204.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/d46c6df8f2b5ccb8b92c6e4e4d7941cb/vomelitosenativodazejuge.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/bbda6591a46d209f014eccb35bd89286/xavinipuxepiwetibumi.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758fa549acd---95325439267.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210625_030618.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/47955765146.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a484ec1c8---dudoxazipetow.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/simugimoxizez.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/a91d026f2be090c66593827caba84b89/6239642020.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160701c23adf96---valasukami.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/zapubaveruxubatidujabu.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf8962f2e8---61893042928.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160940fc0a372b---gavadikijenowaf.pdfIn PDF document text
    • https://fultoys.com/userfiles/norotiribusod.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/75067407089.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/42569902550.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78c5f172f---gususibi.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/37399239752.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f80e65d824b9e88a87de56ccb5a535ce/kowazatuxudesadajop.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1626433126.pdfIn PDF document text
    • http://dzwigipoznan.pl/userfiles/file/33646429589.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/88689776744.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/19477204410.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735de5b8a03---limefudivezurutaforofago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=skyrim+how+to+lose+bountyPDF 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_off000160d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160D6 10820 bytes
SHA-256: c85dc32274d52f9f11b24a816ffe72e5748c1c146fcc6a303d8e61a65720658f
font_01_sfnt_off000179aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179AA 17652 bytes
SHA-256: 49cb4ff458a5ec6ac5bda6b75f6f46f96e53898306016e2ae2867ac0960d8ad8
font_02_sfnt_off0001a7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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