Malicious PDF — malware analysis report

Static analysis result for SHA-256 8838e684099fc951…

MALICIOUS

PDF

81.4 KB Created: 2021-10-22 09:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1726f02e94ffacf29ed363b72faef3db SHA-1: 66c361632c54f04cd077756577121324b8c15bd7 SHA-256: 8838e684099fc951b754dfb1c70e3e97b71e29b11231be6725e4dfc504df32a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, so the primary attack vector appears to be social engineering via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://sivam.pl/files/file/83167473647.pdf In PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1615143a9d82e9---72287632234.pdfIn PDF document text
    • http://thegioioto.store/upload/files/rimilukizek.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/tadowazulofitixuxeboniror.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/tufuwufamivuxuxiritelagos.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/78211599070.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16144453243641---55004267688.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/94998478859.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/36398685187.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/wodudim.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/24948276759.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210907_161003.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/pamaredenuzaguvuf.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5aef75b6c---takaravurus.pdfIn PDF document text
    • http://gardatrans.com/content/Files/92492264588.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/rumatolegefujezi.pdfIn PDF document text
    • https://springfordfarm.com/sites/default/files/uploads/file/70851929127.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/9586520554.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/17679757887.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161440822e1cb9---56903223563.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/fatagit.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/33716331607.pdfIn PDF document text
    • https://tele-video.ru/upload/files/93989082458.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210904_A32FC72ABB79BFEE.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/BcFPVxLj4jw/uplcv?utm_term=harry+potter+theme+mp3+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_off0000dafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFE 10760 bytes
SHA-256: 0ef2e4482bd4d069d8464b3f8001d544025bcec607e17238eb1a8027117dfb5e
font_01_sfnt_off0000f39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39C 17140 bytes
SHA-256: 85d32aaab1e9ecc680516111c8eee362fc494491b67f512edbf0e48adca7f04e
font_02_sfnt_off00012004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12004 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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