Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0eff97b8ebe34b0…

MALICIOUS

PDF

86.1 KB Created: 2021-06-26 23:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 83061d4d26bb1f5978103d4f6993fc24 SHA-1: 83aa2b589e77aaa3c71ebdc37f0078a8399f6a2b SHA-256: d0eff97b8ebe34b032303086d9de35a942a8a76d559fa9943f63323b46bf1dc6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. Heuristics indicate it functions as a link farm, likely intended to redirect users to malicious content or phishing pages. ClamAV detection and ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://happypalettebnb.com/CKEdit/upload/files/74566560711.pdf In PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/931f667e2166f2930dca7c89ddedf637/78321215363.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160759536e3c43---tolipudefavisanunavax.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3deeeb1a0---8808231129.pdfIn PDF document text
    • https://madopin.com/calisma2/files/uploads/deleresuzov.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be73ec9ca7---dudeluv.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/dvt1pgl5ai90cdfud67g4eiift/74071659555.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/2a6ab11463ff6b5cce5ae067bf316406/xalerebadejosipu.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a45a4dedb08---papimo.pdfIn PDF document text
    • http://snypes.nl/img/customer//files/lamulara.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/kevekiwesonimub.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/14484349852.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/bd57b7f886cbda9f5e4721e78250ec4a/rupan.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608784e787af2---90321397960.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf25d15ae9---bezuwe.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/36370680496.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/xikusoxifuxusamogisura.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/54211158650.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/4d4e8a9c842b702f8b404b320c70ede6/supakajabafoxixegev.pdfIn PDF document text
    • http://usmleworkout.com/files/file/busitemaserejafugaviw.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5fd7456b3---dokemolexakipidubu.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad35d586711---59364083857.pdfIn PDF document text
    • http://sciattella.net/images/file/pakowolomotevini.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/b595c3f9d6fb1a6f24e5f5fbd0496d8c/17251321206.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/18190531889.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=autism+and+deafnessPDF 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_off0000ed00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10512 17764 bytes
SHA-256: c6ed1fa7a36e01b060cefc840f6f824c5d2b5dc0a31aea52da1c378ea1e7ccb5
font_02_sfnt_off00013284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13284 10328 bytes
SHA-256: 75b0d702d2c549d7a2235eb56c26ee74003a3f3f77c4fedbee30a465ac6a1b14