Malicious PDF — malware analysis report

Static analysis result for SHA-256 07673ac4646b23a1…

MALICIOUS

PDF

82.5 KB Created: 2021-09-15 15:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d8c568713de94e9e91274e9e51aa7ca0 SHA-1: 47b733f63da6fa39991d77923c72b8b5985e3faf SHA-256: 07673ac4646b23a1d56e1a00e9ddff89f9595615c39839a496ce2d568b9a1763
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ristoranteibucanieri.it/userfiles/files/golugojovileputiv.pdf In PDF document text
    • http://vswet.ru/f/ganawatoxapavaponapop.pdfIn PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/30295053959.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/85987153373.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/xebupexex.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8b614ab98---gemujamavonope.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bba08027dd---30460948525.pdfIn PDF document text
    • http://tochalco.com/uploads/files/77364554373.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/fipavobimipururumiduju.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/27613590766.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/sawemakexenubisozisema.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/fodoz.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/vodemegegasiwofi.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/7402242954.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16137426ab576e---15297276642.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141bffb2b5a2---ferujunanugulijajurur.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/22264279758.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/76032980526.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109071651308264.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/23509732483.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210912011333.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/55692808662.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/26757787769.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=i+can+download+apps+on+my+iphonePDF 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_off0000dca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA4 10732 bytes
SHA-256: b13dc16fb0bd424b3c930b9304806518d9a1c4df2218902f0f15c115e56917a0
font_01_sfnt_off0000f525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF525 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D37 18264 bytes
SHA-256: 3e1af7843d46a0d3ea970773361946b665ac4e129f6bec36eab2fdb8ed050591

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