Malicious PDF — malware analysis report

Static analysis result for SHA-256 36df22492bf281a4…

MALICIOUS

PDF

85.8 KB Created: 2021-08-06 12:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d14caa8e49b6b9bf47a252043ba41b1f SHA-1: 93d83c78c1b181fc4640884d6f814c95f61b6722 SHA-256: 36df22492bf281a47ac2bbafe4b393af6225b56b03507d1837d76aff44dc3f7d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, characteristic of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/13c841fb6f74b9b2f4ea2d5b8f7107e8/29415783979.pdf In PDF document text
    • https://408of53crownstreet.com/assets/media/files/xelitupikud.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/gepal.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/23743510349.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6bb939793a---nuvaselarajojatasoxawe.pdfIn PDF document text
    • http://nhs1966reunion.com/clients/1/1c/1ca8f1639ee69cd7806809ed3bcda9bb/File/xutupugunekejaxanow.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/41714742401.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/xapas.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/modawisiladajim.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/38579367531.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/vaborivapadiwenejowol.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/luxezijerosaloxovitup.pdfIn PDF document text
    • http://topas.lt/userfiles/file/79218488592.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/26797260856.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/640941422ec6683deefdf4d21f0fc324/dukiwakizu.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/48857179954.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/lufulumizamonezot.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/29412415.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/gukaludogazofufeg.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/fc70ec73f265f9473c876470a67a527b/77260874107.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/waxizewinapovafotev.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/vigevemapowaronula.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/vabalifadelokabajuxuluwog.pdfIn PDF document text
    • https://yuss.it/file/50224949290.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/93480606895.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/gejuwelesuxipoxonefakuto.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/jigidosokugimulinu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=comparing+and+ordering+real+numbers+worksheet+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2B 16072 bytes
SHA-256: cab8ceee6dea85bf437db9fdd562b8a0aef74c4066cefe7f2a83a632bdc35db7
font_02_sfnt_off0000ff34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF34 17448 bytes
SHA-256: 113c75a49dcae06921443a699bc155e2b44411e5736bf92037cb2f0cb5fd4ab5
font_03_sfnt_off00012d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D71 11288 bytes
SHA-256: b8d954d09e235638bdda93274626e2bee979ca9bae7edb76129b4e45857d8aac