Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af8c48ca02b641e…

MALICIOUS

PDF

86.6 KB Created: 2021-06-30 03:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a9654d64de2a10915a9f3606b9b98eb4 SHA-1: 1be8c3d580b0828bdbc2ebd9d9d772a024330f95 SHA-256: 5af8c48ca02b641edce92ee8a17bb8a9be05f5313eb2b7b2335794712ead6702
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm with numerous external URIs, many of which point to potentially compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • 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.
  • 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://detskeihriska.eu/ckfinder/userfiles/files/4510927781.pdf In PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/porulotenafutasetejumo.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/1vjs9nrn8vbhlumtmjf2qlmiio/xasobu.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/11490452830.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/zolelemipokipok.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-29/20210629065551894885.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/mejes.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/32994568259.pdfIn PDF document text
    • https://sambelteri.com/contents//files/guxarolekujafe.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16087f554d5bfc---sijegon.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/kozamivod.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba1ec497c5---jumezuruma.pdfIn PDF document text
    • http://m2m2design.com/userfiles/99033509915.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/mexokolidoxudujunafala.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/08ac0a9eaa53c0254d9f8d2762884fe4/mukiwama.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/p649fdrlnba3uibkdbieauit6n/xoliva.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/97044871059.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/32699638814.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/judadew.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///fupuzafewadalexiwil.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb42b3e81d2---ralapalomavugunafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=cad+file+viewerPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8D 18128 bytes
SHA-256: 534547f9ef449fdfd77a87a5f875ad8a1d8fed1ad1d34aad5d8676ea8c995908
font_02_sfnt_off00012e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E85 10040 bytes
SHA-256: 7b6ade5da83bd0b5f2b084eae7b87e6a0abafd5c47635ab26fca8c2f132a0f2b
font_03_sfnt_off000144ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144ED 1732 bytes
SHA-256: 5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a

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