Malicious PDF — malware analysis report

Static analysis result for SHA-256 710b4afdb8278bb7…

MALICIOUS

PDF

73.9 KB Created: 2021-09-18 01:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b2bc5f4df6591270a43f89392b18620e SHA-1: 355d87f763e0996262c95171cf8ce7c1bc0f3143 SHA-256: 710b4afdb8278bb700581cf9a2b757743a9bdf0e8e6a0eaa4fc9ceffdb57b8a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The presence of embedded URLs and the overall structure suggest it is used to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://aaykpn.com/uploads/editor/files/39976718275.pdf In PDF document text
    • http://web5gstore.com/Files/files/52767511968.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/30364259382.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/55336354151.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/zobigukovepurobogubiperu.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/15049656670.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/jemefuketebeka.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613122e0dc35a---28588742226.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/balel.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210901133307.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/gozozuja.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309f49070dd---47037548410.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/ae926d184a2c32f458bd073e764dc7bd/xilafesi.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/gewinafubimo.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16135dabddb2ee---sazilukiliradudo.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/28314648473.pdfIn PDF document text
    • http://soupworld.de/upload/file/gifafajikaze.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/41190282040.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/74558337996.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/jixedewiran.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/70261200280.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/8bd3ff25b8e43e10feeea6765c5e43da/gidovubukigizamujuditenal.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/4996199815.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/jegogej.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613460cba77a2---dukofajixud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=life+goes+on+tv+show+streamingPDF 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_off0000bdc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC9 17028 bytes
SHA-256: 399f88b3b941027ed403a65b1c6514c90721820cb626158b3cfb422245d506f7
font_01_sfnt_off0000e9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A9 10724 bytes
SHA-256: 46a625aa075cf51727be61dcb17ec5ce2bedd600af2269d18817d7726c423b68
font_02_sfnt_off0001022d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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