Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e498cb493cfd8c3…

MALICIOUS

PDF

99.8 KB Created: 2021-09-17 05:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3c396b2acfc7ecae825b3435b2b7416b SHA-1: 8e736f7dd5d7de686505563be9f0804520c41cd3 SHA-256: 5e498cb493cfd8c3aafa0e70608711708435e7535d0f38e4e56d0f5f6e39a692
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to malicious destinations. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload is intended, aligning with the 'Pdf.Phishing.Trojan' signature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=the+incredibles+full+movie+123 PDF link annotation
    • https://searchkar.com/ci/userfiles/files/44953937786.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/gewaxogibifeg.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/jikawef.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/5237249364.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fa36332c3b6e0404414d65cfa42cf1a5/loxawep.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/86215801415.pdfIn PDF document text
    • https://finliz.lt/i/File/36506648971.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/dopavofovitufodewirajuwuf.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/41977162367.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/73366272862.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53053825601.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/27698948764.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/rajikukakisuzaxeladoroxe.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/644eab2a737f823d4b36d7bd416fe4ab/16581079541.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/ranominagawamojadufuz.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/kipemuwakurumalu.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161359b5da2cae---59124535690.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/88971486689.pdfIn PDF document text
    • http://kmsenior.org/file/files/41663252718.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/677937835.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wuvirexuvukaje.pdfIn PDF document text
    • https://jin-ji.com/upload/files/93000610032.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210915190851.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/45381334832.pdfIn PDF document text
    • http://hoachattn.com/image/files/68160289943.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_off00011dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBF 11092 bytes
SHA-256: 01b41a0f00f87f7d698b8be41b409dc0ba302d0263255487f55b3e4ff5093685
font_01_sfnt_off00013780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13780 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F92 19592 bytes
SHA-256: eb727baf92d384ebf779a3f1b66fac22553d199729bfab9587094eedbc613323