Malicious PDF — malware analysis report

Static analysis result for SHA-256 60cff162d160bc8f…

MALICIOUS

PDF

85.8 KB Created: 2021-09-13 03:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1889a5573a487ba65d08e7767a270567 SHA-1: 9db6c5ce5217c649577cffe2ccd5600169e87b4d SHA-256: 60cff162d160bc8f31eead7425a50f60a4b0d48d789c54263defbe9464288b30
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/14372473742.pdf In PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/caebe0c3c05cc5fd458590f223b1e212/95058600316.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/dosifezox.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/vevosexomifof.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/30066348497.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c26457bf07---neruninovefamaguvimenir.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/pasigodonu.pdfIn PDF document text
    • https://phuquiland.com/upload/files/dodowemixanewafedine.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351166bfe7b---67135892651.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/vaxapokawabed.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/51411320014.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/75796700465.pdfIn PDF document text
    • http://sushi-belovo.ru/files/36448645460.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/257996458.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/variren.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/2305362373.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/49787440645.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/50403274958.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/figogixavusodajusowebewa.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/98016594906.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/xarubifaj.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/nuwisigasaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=best+graphics+design+app+for+androidPDF 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_off0000ebeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEB 10904 bytes
SHA-256: 4d0fb8aabca6d6da0bad8e3f66a998b7bc76ac2fb0244eb6933cbf0868fa695e
font_01_sfnt_off000104eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EB 17168 bytes
SHA-256: 1101f4f7837e8e5a53f2dd970ac71b934fc33a1652d82a24a675e6c66fdcb094
font_02_sfnt_off0001314f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1