Malicious PDF — malware analysis report

Static analysis result for SHA-256 b20c34a6003ce548…

MALICIOUS

PDF

77.3 KB Created: 2021-07-02 09:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: caeb6d812c13ce34d1aa4a3feaf3f987 SHA-1: 1d1a114229c8ed69959f01a152a9af51bf0bde97 SHA-256: b20c34a6003ce5485e967d6c600092af15b3e14cbd778738795b019a79cd79ad
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the extensive use of link farms suggests a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://irlanc.ru/uplcv?utm_term=four+pics+and+one+word+answers
    • http://ranaghatpchsschool.org/userfiles/file/lavorojuzizox.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5ae95a963---kasutoworox.pdf
    • http://tuanayapim.com/rsm/files/xaditanapeluk.pdf
    • http://birnagarcollege.in/userfiles/file/nufuzubopad.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b16705094b8---sexufiwirigudejenidapezom.pdf
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/a12ca8f64e935423c2e927457522e7b3/xiwufomosi.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a5612354a---71977707044.pdf
    • https://hagepoorter.be/files/files/90904413977.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dcda9aa5f---43899199765.pdf
    • https://mmszke.hu/files/file/62518310580.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/4106e1a63a3e6ad3c17ca329b523c9ec/luzanapuraxixor.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/8a3e2caba3d93519b801189965cba118/87833833919.pdf
    • https://rybczewice.pl/userfiles/file/tivofurugopafikugolaja.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/50tkmpmk8sert0q98v2nchj7do/84008019152.pdf
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/91909596226.pdf
    • http://premium-h.info/files/files/85119303091.pdf
    • http://www.aadhar-interior.com/userfiles/file/xademevazidetesob.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f75719933---68609793661.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/cd1b78a58f11641cac16047a985a4381/59105114476.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e596003c9d---gemaro.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca3bc513e0---xamena.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb7871d635---rokudetulatezoposikadiv.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/b2uum4efjf6tm810fq86ubr4g7/97064721144.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e9e999667---dasifovoto.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbab.bin
7a5c7482e08290070441937b7780374943d29a99360883e4b722569a4667d330
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAB 10524 bytes
font_01_sfnt_off0000e3c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C3 16792 bytes
font_02_sfnt_off0000fbd5.bin
5e36caa6df6ac56b1ec2bbb563d1b4e694883bd8b311dff0e20edf24702517d7
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD5 16948 bytes