Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb540ccd3afdd24b…

MALICIOUS

PDF

101.5 KB Created: 2021-07-04 01:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: bca77437445af1f9e2116a60424af7e6 SHA-1: 3d03cc1f39127b16536c2d9f9cf9e7ee78b28e4d SHA-256: fb540ccd3afdd24bc3412aa84778615b1847876bd75eae88e6194a02ad864b46
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. The presence of numerous unknown URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9358

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://marymo.ru/uploads/files/vimemesodepovavu.pdf In PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/mveidemtd5op8aqbdlnfvg1sd1/fozup.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/soxela.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/7b65000b13f3334468988e01b8d9fed2/74797902850.pdfIn PDF document text
    • http://protok.pro/upload/files/61150715014.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/50253328536.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/wetugevebane.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/d18h5hanbqj38kdc4tk71ns7sd/wuxexesotu.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/89820993720.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/fdd43754cf4b2ecb1cdecea87395a5b6/6396298685.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/3otvgdn7kmplagvvt19kla1juk/patujexixad.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/194155c79781e8848a801d3c1b29f8a6/pudolevepijujib.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608468f107de9---52258782696.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/68374813644.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/49130749987.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d58542623d---21309981952.pdfIn PDF document text
    • http://leakefamilyreunion.com/clients/63964/File/wivuvupejojakesetugaguxar.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/smle86ffkl6hpbvc0acrbl3006/puvawixenuzubigiji.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e16fdbccb---80948438186.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/22760655411.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866f351bbce---raluzofalegazakavefewaz.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d15d7cfae7---24735599394.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a89987de476---dazelaxizaxefov.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1e2488460---91319293160.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qecvcn3vdgj4nlesi30tjnu2t5/tifejo.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/d4fcef9a0fafe1a6054376626e25a05b/9482245791.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=intellect+meaning+in+tamilPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000168b2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x168B2 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_00_sfnt_off0000f2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FA 10136 bytes
SHA-256: f722177433995aa4249d3c1561daef80728a25ed585e3db7f155ba3db9ad0b6a
font_01_sfnt_off0001098d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098D 23176 bytes
SHA-256: 987b69fe93daf6eba823efd36445ae48f7d308089db9d5e7422deaa2329dea4a
font_02_sfnt_off00014322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14322 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_03_sfnt_off000150a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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