Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8dc045a033bfd4f…

MALICIOUS

PDF

119.7 KB Created: 2021-08-20 12:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 70d10ac3ee02f30b89a1e8a5272076dc SHA-1: 7ad4673c32b2389c2d7e1c4454537002d5c9003a SHA-256: c8dc045a033bfd4ff643c700f04112e00595a17f12dc282a1019fbc3206e9828
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF contains multiple heuristics indicating it is a link farm, with several URLs pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and link farm structure are designed to obscure the ultimate destination, making it difficult to determine the exact payload, but the overall pattern is consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fde5e6aebfd---24098892105.pdf In PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210818133321.pdfIn PDF document text
    • http://www.toptehnik.si/images/31982663543.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/wegubufada.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/defazizowisomuvopareg.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/bodujogekopabepositus.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/8qff3hcg99tmecsd3kt9362vh1/22944066584.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/84077669165.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/memikalumukido.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/xedesiw.pdfIn PDF document text
    • https://sainaudit.mn/File/843223940.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/77728556001.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/25608174534.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114f4acd5fa1---20227558440.pdfIn PDF document text
    • http://bscartridge.com/pic/71734683456.pdfIn PDF document text
    • https://aedwea.com/upload/foto/gegosuxefarepu.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b270eaee3---4543238755.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/gosiwamoto.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/cae8997694c0b8e7d95177f6e105f5d1/66129972756.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3e62c2e03---80118849482.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/37475731056.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vode449sink95lontf1p34n5t1/93587618550.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/83861910481.pdfIn PDF document text
    • http://rc-modeller.se/images/file///walotodujuresejim.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/44d59e1c03f98eaea439f3ce5527a363/889033470.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/jurawumowivek.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/87374195310.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=interpreta%C3%A7%C3%A3o+de+texto+para+nono+ano+com+gabaritoPDF 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_off000169ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169CA 11300 bytes
SHA-256: f5afae92a0e52fbe91da43955b4936e715d0374abd56efadb8a44786a6847418
font_01_sfnt_off00018339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18339 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B4B 20744 bytes
SHA-256: 067f3535216199c856ea702cb42d28906fd1fe2a98f059518c29c31015daacbb