Malicious PDF — malware analysis report

Static analysis result for SHA-256 45e614fa3d994a2b…

MALICIOUS

PDF

73.9 KB Created: 2021-09-01 20:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c9aa6db972714ca56cd8af493829444b SHA-1: 71d992be0cacbc88c2a81223df50333a155c82e5 SHA-256: 45e614fa3d994a2b00387edeb61500e3e8309f052454eb7340e3cb483b4e0b48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection for phishing and trojan activity. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/80b1bd0b22087fba16af5a85a1843107/mukowofefojumuwigogiva.pdf In PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5b4a4aa3a---32836897412.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b212e990a7---13373198469.pdfIn PDF document text
    • http://samtekelektrik.com/files/99909682910.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/89736966776.pdfIn PDF document text
    • https://noventa.cz/media/files/file/25932733054.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/gevazamabikojowazokowiv.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/ekog80bshicm9t0q5sj5gciq21/87196978509.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/pavujano.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210601_011327.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6301ae5f10---48209385714.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611a786b6ba19---68037976592.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/38ac8cdf0004732772ff281ab178d0b7/xojono.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/sotexuzofenu.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/muzawozojowipopuxobasu.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc30548cce1---linizigodozopapifawataja.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/bekumetarojumas.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4c4258870---tirolosaduk.pdfIn PDF document text
    • http://menafundinfo.com/userfiles/file/kekiren.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/betinujozifeziriju.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/30691671395.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/pirefalokapuda.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/nujixegekumewobux.pdfIn PDF document text
    • http://congtyvima.com/images/Download/52202961032.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/68255971523.pdfIn PDF document text
    • http://saydersan.com/firma/files/15602140477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=pnb+rock+abcd+mp3+downloadPDF 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_off0000be7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE7D 10676 bytes
SHA-256: d01431cf8cd3e156afe2c8fcd08f4edf6e875a31332717106c7d854d4f8084af
font_01_sfnt_off0000d6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED1 16632 bytes
SHA-256: 7fd08cec6ad9bac997c9195c298f922c68a072450067b165531391ebfde421e2

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