Malicious PDF — malware analysis report

Static analysis result for SHA-256 e549bc05cb1aadd8…

MALICIOUS

PDF

84.4 KB Created: 2021-08-16 08:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 34d57151f45b0de8cf49a0a83a4327a2 SHA-1: 89f3c4a5f7d745214b045a693da1401badcb101a SHA-256: e549bc05cb1aadd8b80d6c909878b41e5fa552e838bb6900e7df6885f5d2331f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various websites, some of which appear to be compromised CMS upload directories. The primary purpose seems to be directing users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://equinox-e.com/upload/files/parutarapoge.pdf In PDF document text
    • https://clinicscrm.com/img/files/gutixu.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/28832900663.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2205ed3eb---39410700648.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/worisafutibariweleroxek.pdfIn PDF document text
    • https://iword.de/userfiles/file/kopupafemo.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1610ce5cf449a2---sewatosebesoseledese.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac021643025---70235468096.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/3d17a18f047166094ecaa40c3a9b55ff/zatafasadubiteron.pdfIn PDF document text
    • http://cobbpaynefamilyreunion.com/clients/862770/File/rawijexexo.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb3baa739d6---26316475102.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/zupuwosoganutemabaruf.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a750c6e97cf---73497111080.pdfIn PDF document text
    • https://anfauglir.com/images/file/ruxitekede.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/56089386417.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/lisalavonufesusuveve.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/68433803031.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/fidaxuweguli.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/13338460085.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e68ba63b4---27363953098.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbec744a317---2192940204.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/k095eucc83ukt3a4ssec1bk8fi/34409618407.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/7e4432a6f8331d6ed9d698a51cfb4369/turutaxuzitijororaji.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c45c4462d96---46468830408.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=rarest+myers+briggs+personality+typesPDF 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_off0000e61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61A 10892 bytes
SHA-256: aeee90f7fec885cfcf933d9d2eca4921306065a8aec40c8d753ab331099d8368
font_01_sfnt_off0000ff1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1E 17004 bytes
SHA-256: 399048d842dd712bef2009f3b0ec220252b725424d5d45e82c5a4850220bfc53
font_02_sfnt_off00012bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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