Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f9e9d4faa2211e…

MALICIOUS

PDF

80.6 KB Created: 2021-09-19 13:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f68d0f4994e7a9012d5e8e5ac39f2081 SHA-1: a00f4b1d72700d51047dd76b03e84c743942df2c SHA-256: a4f9e9d4faa2211ea2b45b9483b5ce23f6e0701b631e6db57dd14c7e635b6a18
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and embedded links are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://dekobonner.de/userfiles/file/zadasobukukijexubi.pdf In PDF document text
    • http://www.addvanceo.info/userfiles/files/xatozakiwesafinimeliju.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/84432930071.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-11/20210911013600280518.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/79722719811.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/78245623233.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/tosaludin.pdfIn PDF document text
    • https://taperagi.com/contents/files/ginigevi.pdfIn PDF document text
    • http://ping-property.com/user_img/files/saguwelevujotanigoribu.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/85151448737.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/77292667893.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/p5pe6ih97fhncpmu04go7sg5d4/kapikafa.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334e63e85c1---78431207222.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16142980a3dbda---pimevim.pdfPDF link annotation
    • http://hidropro.hu/upload/67520131312.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/81993904843.pdfIn PDF document text
    • http://beautydent.hu/editor_up/9894787670.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/57300125044.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613aea0381d84---97685373751.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/rojixapuzupajam.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210906094824.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/gipefiga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=vidmate+mp3+hd+video+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_off0000d6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EA 17644 bytes
SHA-256: 0b0782b056dc34afff59e9132111a3f1f57ad35b3e19882f470698277f56175d
font_01_sfnt_off000104ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BA 10680 bytes
SHA-256: 7a96f5fc585f10c0f96fbd206570b4ac029dc606aa419395fc3cd03ab726ac99
font_02_sfnt_off00011d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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