Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc1b0760878f0f69…

MALICIOUS

PDF

207.7 KB Created: 2021-06-29 05:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f4e4002f7a5816c34d744edd415ab25a SHA-1: 59e38896327a1e94b7794d4ae3e979d48055f313 SHA-256: dc1b0760878f0f69d5a5bc8f90757cde3636b32fb2d1b6e7e1c332b637ad8a99
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm and SEO redirector, likely to facilitate phishing attacks by luring users to download further malicious content. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to exploit user trust for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9852

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8ee09b2e1---vomenewiderepapogorejed.pdf In PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdbb3287d3---50711639127.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/6hgqnsig03kios4o1c599kn8hp/87095975289.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/2398f350e9dfd34576d5dfa7ece0bad4/6649644560.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad7ccb1ea2---ridikexomo.pdfIn PDF document text
    • http://mobiliteit.nu/files/90075472984.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607602c4353be---83895037003.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/venewab.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/nanenumotozokefekevekuzes.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/gjvoi00m2a8j6sl8flir4fuln8/sonunota.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/ifspannbh270smalebgktbh821/30375350823.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b8816e61add---88347252567.pdfIn PDF document text
    • http://camonetinternational.com/files/file/95710280880.pdfIn PDF document text
    • http://qytbearing.com/upfile/file/58997886402.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/fipumeruvunodunoruje.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/ah1fjkgcpl4sbftgpeveugvh1k/96533947806.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16087020342069---8752597361.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b20ff962827---97475295536.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/mnn4e76bpcmmmcq7c09rkim3c3/nenolijorutemisub.pdfIn PDF document text
    • https://area5srl.it/file/64487916132.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/vugopikaw.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/709329638cbe2460ec0cb9fca510135a/49427484930.pdfIn PDF document text
    • http://rentaruedas.com/files/others/vukulosometofinisidima.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096bc589870d---42276265265.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/d37a767b128532cff7adc7a450e08339/wirinupapitonovozilofenis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=illiteracy+as+a+social+issuePDF 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_off0002cccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CCCF 20632 bytes
SHA-256: 1b1af2eeeae687b58655509f3feac69769c61ecc5c3b3a9659e0dd4a602a61e6
font_01_sfnt_off00030156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30156 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0003196d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3196D 10284 bytes
SHA-256: d8812d4bcde56b01e32e2801141acf3475333f035d8431478e5bf6fc24a4df1d