Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c8be2bb42f2f3d…

MALICIOUS

PDF

90.8 KB Created: 2021-08-12 02:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 86f12c5d7219ecf7f7624558632207b1 SHA-1: 853441951b0b20975d62be29785c1ca8754e1203 SHA-256: 38c8be2bb42f2f3dde64415a488b1ae79c97ab48cc2e2b18b67afa2d2b977584
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests the document's primary purpose is to lead users to malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/m3t9dvamq6l5p8f8jtdgfcups2/79723567345.pdf In PDF document text
    • http://fsgpj.com/upfolder/e/files/20210617155453.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/50682840783.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/3ju6musvvrtm4om5jc4ipj0e51/naponoga.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/mugajalezasusosijoz.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16107df23661f5---vekezozevonotizalobuga.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608706f9b3a3f---watomabi.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/677fd7ed1ff17db78e59d0c040a170de/6462838223.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8f95037abb20d77679413683700c1885/92900683519.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/8mhj971rvoc2n66sskbbt5hlc9/mafuwupiweg.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0635926001626739878.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608401686a414---migebaziboxesuximosiw.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/ziwirizonusidekowumenor.pdfIn PDF document text
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/nutewubixizavedagerox.pdfIn PDF document text
    • https://dineflon.com//files/64792690512.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69d8416be4---xilewejujozamijobuwemin.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082c5a785df4---41132676335.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/siguvobomimuna.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/97534851428.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210706101012.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/25456894449.pdfIn PDF document text
    • https://migger.dk/userimages/file/virinotebuwisifapusewukit.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03b71a3d86---88516250805.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/ebc916706bed147d4887219d2405e989/gurunupukevixokajaza.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/28721091994.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+download+waze+app+on+sync+3PDF 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_off0000f8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B9 10736 bytes
SHA-256: dafedea8ae3b2034b6b4f391ace1cd38cdba8478ce5c942fbd80d7221098098a
font_02_sfnt_off000129a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A5 19796 bytes
SHA-256: fead1530cc736f51631465e0e6deb77d0aa7fbd2ed3b8dad50e7432d3d1aca5f