Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0518ee0e9a750ad…

MALICIOUS

PDF

71.1 KB Created: 2021-09-05 21:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 55bb95759525fd101f5fd46016cf6819 SHA-1: 8080e351c60a6ca388a73e6b4983823b0bf16e3c SHA-256: e0518ee0e9a750ade59be2c61dbf902d8c3a04c5ce84fa98864e90519c714ced
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan payload. It utilizes a link farm strategy, embedding numerous URLs that point to compromised CMS upload directories and disposable hosting, likely to obscure the final malicious destination. The presence of a 'clickbank university pdf' UTM term suggests a lure to trick users into downloading fraudulent educational content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://mjacz.cz/soubory/files/gimejori.pdf In PDF document text
    • http://qlionshousing.ca/userfiles/file/1289685483.pdfIn PDF document text
    • http://tourgrodno.by/images/content/file/zatokunonukuzikimukosese.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdd1835a40---62302365418.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/428c3e0eb5492c0e6f54a99e051bd7d0/zewurunibuwu.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e2e9c7979---3878721509.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608681a4a5c47---55203260826.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/17971162009.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16094ca213a0a3---kofegiziwusup.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1e928ab4a---44534091495.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/35913317221.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/pozigefurisaxexok.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ado74d3csejjmthmqc6anme7d/57478447244.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a449b0740ff---fuxedogevoduputo.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/31887513766.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869562ed7ad---23451985089.pdfIn PDF document text
    • https://eslms.com/userfiles/file/8339411052.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-08-05-23-10-32-4peBnc9l.pdfIn PDF document text
    • http://aweibel.com/Photo/file/29145653906.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/84729618500.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/43368564829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=clickbank+university+pdfPDF 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_off0000b30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB30C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1E 16604 bytes
SHA-256: 1e5eba7f0e721068b91fc1ac0e425710f0b547b25893d634a16bf691e7fa9f59
font_02_sfnt_off0000f5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B5 11036 bytes
SHA-256: 00c8d5884176dc208cdf9c310f40a3c67914c746b2fc1933f398c3e682376f37

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