Malicious PDF — malware analysis report

Static analysis result for SHA-256 50e7a4fafaf591cc…

MALICIOUS

PDF

85.0 KB Created: 2021-08-26 04:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8c28de9436d036d46a1360e963598136 SHA-1: b184d3908868622e1fb8c14f462b3f617fd1eff2 SHA-256: 50e7a4fafaf591cc2a1c3642d4c50ad4efd0667b393e511de9adecef2c40352e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to potentially compromised websites or disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

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 https://madopin.com/calisma2/files/uploads/luritojesedenevir.pdf In PDF document text
    • http://d4smontreal.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/82727925401.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/19013461224.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/82405603762.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/seled.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/pu17tfpgeq9jk5h6qn0qj3mq07/tetezosonukog.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/80912811235.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/83551168419.pdfIn PDF document text
    • https://linardi.ru/files/file/kerunopidesomow.pdfIn PDF document text
    • http://pasted-radio.de/web/files/xuzovuduxixoz.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/28ekp6h834veij3ktaih143p1l/8344238099.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/31826264861.pdfIn PDF document text
    • http://premium-t.info/files/files/26075993862.pdfIn PDF document text
    • https://retta-bg.com/userfiles/xumezoporuzadifetemaje.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/8644132727.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/32332883827.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a825a72c29d---88632459258.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/fufeselerun.pdfIn PDF document text
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/folegoguj.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/8bt1mssmldtr2g1g1hrh84m4lm/gorilep.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/sofenijurejimafexabik.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/96549152803.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f99545a8762---63083820155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=prince+in+disguise+read+onlinePDF 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_off0000e9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BE 17344 bytes
SHA-256: 2f4dda65b75cb11114ce33f115b2de6cbc7ddf902cedc1901fb5b251ae523832
font_01_sfnt_off00011666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11666 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7D 10548 bytes
SHA-256: 8ce874adffc951416c688d22c276f04f0a26fbfbfcf73bbea2e4075fc5fdf613

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