Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4fd20ba19492dd2…

MALICIOUS

PDF

87.9 KB Created: 2021-09-09 12:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 17f9fbb8a3052523e9e9d5f03bac12fb SHA-1: 16cee505a6cd11b9cc020a59e4af89c4fcb86283 SHA-256: c4fd20ba19492dd2c138149a0b789e96d5aaec171382b28a06bafca39b88c1f9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of links pointing to external PDFs hosted on various websites, many of which appear to be compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading further malware. No scripts were extracted, but the structure suggests a link farm designed for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://precisao.net/files/files/refakar.pdf In PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16130585106d50---51797997597.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/nitawozudizuvowevuwo.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/govivupowevarata.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/b5egsk8b8mgulml4tvgp0gq07v/mejisisagelizuxuk.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/zutowufa.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/69361326037.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16136f61c5e18c---22280364904.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/laledanafejipupobumitonab.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/fexabo.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/70330043906.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/99047675134.pdfIn PDF document text
    • http://musikkursus.dk/userfiles/file/58898967257.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/35832030021.pdfIn PDF document text
    • http://skolky.info/foto/images/file/40363043830.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/xezowagenupevalezuvure.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/33049564947.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613387e5173d2---towug.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/wimuli.pdfIn PDF document text
    • http://vning.net/filespath/files/20210903191452.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/38255543811.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/81202393946.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210909091333.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/38343673629.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137663597e4d---bagapepamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=new+mod+apk+free+firePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD533 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_01_sfnt_off0000eabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABE 21352 bytes
SHA-256: 85f8a1773db9680bb17ffea633b75075e82663d87a8e4f1dbbc11217672c6ca1
font_02_sfnt_off000121d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D1 10400 bytes
SHA-256: fbab115218cef25117891789db0cdd2872535133d300f6a05599614f302a11dc
font_03_sfnt_off00013964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13964 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.