Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5bd7b9fe82d5ae…

MALICIOUS

PDF

90.2 KB Created: 2021-09-10 12:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4d69b3749854789d4227d65bf1fb0dd3 SHA-1: d770703f06a1d864c978ef6f070b69c086e3e2e4 SHA-256: 8e5bd7b9fe82d5aeb4b17080abe76a89886b8b719c2e04d3343912636d600768
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains multiple links pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure itself does not contain readable content, but the presence of numerous external URIs and link farm heuristics strongly points to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://cck-brno.cz/ckfinder/userfiles/files/81081212591.pdf In PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/migusidekut.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/lopome.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/telelu.pdfIn PDF document text
    • http://mobitransjogja.com/files/sameno.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/43261999357.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/7e9048b030ef499cc489cbf0acb9780c/tolemipezo.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130c861ec429---89844311246.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/27218694673.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/fagagukuk.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/pifalokuwemebejekerego.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/78797487957.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/panopi.pdfIn PDF document text
    • https://bliznacite.com/files/84289455627.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133296b77bd3---jatafewejogowogajemadeso.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/65728451948.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/bituzekapog.pdfIn PDF document text
    • http://schokobrunnen.com/idata/96726458857.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/jaluxojorupekorimuzutago.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210902102842625.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/jazedajoxexo.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/c0d3d9d83fa71ef3bc73134e04d06177/jijazabedokeverivibuluxe.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/kodagojoduxidobuzoxetopeb.pdfIn PDF document text
    • https://cardolf.ro/files/21243986097.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/vofasawalisufu.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/75281474835.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=mumbai+saga+watch+online+moviesPDF 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_off0000fbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DC 10960 bytes
SHA-256: 5075f0be5c3d3bcc82b6373c5fb6001b2d7f3f83f632561de2e404b39d9626f0
font_02_sfnt_off00012d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2E 17804 bytes
SHA-256: 82e03413e3a27fa060d2b545538d0c202f70d33091e6f562302e380dbfc1a18b

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