Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf7661706493ac3…

MALICIOUS

PDF

85.0 KB Created: 2021-06-26 00:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 970f11ad05b12289e4dae7988bda3dd1 SHA-1: cb780a5b82dfb9ec5be4197ae093ec40b6489cb7 SHA-256: 8bf7661706493ac382cbb0c303f04815332fe82b47ddea01de3e57f411d81356
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The file contains numerous links to other PDF documents hosted on compromised WordPress sites, indicating a link farm designed to distribute malicious content or conduct phishing. The presence of these links and the overall structure strongly suggest an attempt to redirect users to harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/tptr3pk9s94ajt2euhii16vvah/todizukanu.pdf In PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/a1df95e3ca06b9ae31be6b80bf9284c0/padomifirikejojawi.pdfIn PDF document text
    • https://lasanisports.com/files/26731190100.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/makasexuwexo.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/6ef137bba3689503ed55bd869804c342/71239638727.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/09smge1o48bdla9bos0kde4021/13390503691.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1755a741f---48036594811.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/9619ac88055a7dc092468078d2b67bfb/29756706959.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b564c68d4e9---83505335977.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/bea7bce2a1a4453e2e0f0a20a8e0abc8/kubejaxisakagana.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/7d3619cd0b3c0557fdc9213b14caf6af/89431774673.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/73186438639.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3766f287---verojejogozozajagisipa.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/48e97502b93b296175a4b4c63122e378/80641152391.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/23222130114.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/sazok.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/xosofatomibazubov.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/21345369949.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/b9d7fab5a7343b28454d11d3e3b62e3a/rudapejolufanajef.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/7655e8ea36e375db2d9330cb2f36f9eb/97897388928.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad7d40b669---54717895768.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/zufinen.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/e3996da8737bfe3bdbb00e350550556e/viwigedebader.pdfIn PDF document text
    • http://hokeypokeychallenge.com/clients/7/77/77ac66e313b6cb4bf602f1678accca72/File/mavizeku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=vision+statement+for+math+teachersPDF 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_off0000ec18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC18 10524 bytes
SHA-256: 39a26878d09e4f3211b82d89e7ea8eb206a0f305eeab77bd14156d7f69ecd9ba
font_01_sfnt_off000103e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E4 16448 bytes
SHA-256: 6ee6424b81d964c9b5510d2a1bb1293636260eb0c9de0132befcf2d9ffa65c1b
font_02_sfnt_off00012ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1