Malicious PDF — malware analysis report

Static analysis result for SHA-256 659436fefd2ecaf5…

MALICIOUS

PDF

98.5 KB Created: 2021-09-04 22:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e8379983451fbc3cc1707797150d0fb1 SHA-1: 012d3fff1902d83484c0b0b202e9f48374d946fb SHA-256: 659436fefd2ecaf5a4ca4712f057ee33d00e84a86b86ba1754bcf44346d6936e
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The heuristics indicate the PDF is part of a link farm hosted on compromised WordPress sites, suggesting an attempt to obscure the true destination and evade detection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=embed+a+pdf+in+wordpress+without+plugin PDF link annotation
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c640328bf---74982759964.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f21eb0feb7---poxazomik.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210707090017.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073d80be02ef---fiwef.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/90339196266.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/rofuragexirixotozuxud.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/46855971900.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/26517592565.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d41c3751d09---robazirabiwitawiw.pdfIn PDF document text
    • https://hobbypet.cz/files/file/likarasadigivokutepavinip.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/95915467387.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/0pv4em3bpktf9pu5v9djuscfvh/motokojiba.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cebf053c85---5719443162.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/peraloburomagubofufimusa.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad911120e7c---28591928912.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2e1d20246bbce167142b828be59cf2c0/lolugesivoduvovax.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/2367600997.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/v75o20s9hr97gookbu7hr717td/10738022237.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/19lg1h9f9ptujdjd6khdcbmcbi/xojopupifukumofara.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/tfkj146oemqggnl8bpkm82c62g/fajow.pdfIn PDF document text
    • http://texmet.pl/userimages/file/jatezili.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/zujesavagivumekeruwejoko.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/89274568333.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/nobovokatebo.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/871baaa1731e248f20d912c57373589b/50055326783.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/a9ga77e7jf2eq7eqc03u3ju4mn/mojavamabesusizobafilimuk.pdfIn PDF document text
    • 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_off000113e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E6 20452 bytes
SHA-256: 9f8b2a14b945e9c8a9c7e68d7e643b3771600da64fda429aab84d8262a0ad5fd
font_01_sfnt_off000149fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149FD 11252 bytes
SHA-256: 47983ca039666a12ccaf0fc9d5bc1dc57c319f66a455fb7746521bf5b0f16de3
font_02_sfnt_off000163d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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