Malicious PDF — malware analysis report

Static analysis result for SHA-256 123cf826483dca1f…

MALICIOUS

PDF

70.8 KB Created: 2021-09-11 07:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a1ddf60d12f75928e64b45591c51f67c SHA-1: baadf61aefb855963e26f63c5bdcea8632a1246d SHA-256: 123cf826483dca1f0a4a9b0e5349fe79bcbdd741c2a006287926afd32c0350db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous links, many on disposable hosting, suggests an attempt to obscure the ultimate destination or to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/ce725e039d0a25295f5b2e6ae96da9da/domoduluwonujomokajetedug.pdf In PDF document text
    • https://hygradeinsulators.com/images/uploads/file/pimuxixorepizolonukubik.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/86831902879.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/8170932375.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613528683bced---kuzomenojovebu.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/52971798213.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/rekazadukeselanugeba.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/57243584482.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/wetikinimelulopi.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/99741051496.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/69243200259.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/vigagilekoxuna.pdfIn PDF document text
    • http://ymmicro.com/files/files/31496723598.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/56163955316.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/vegaruzuritag.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/50604802886.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/61912589858.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/fedavitu.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/9608058480.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d37ebea99---94359453871.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/28488971714.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/pipareg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=droid+razr+phone+casePDF 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_off0000b450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB450 10528 bytes
SHA-256: 3d7d5630453fe6596d2fde036dda49582d6253297022fb3c991ed19a1e24e773
font_01_sfnt_off0000cc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2F 16196 bytes
SHA-256: e92b76bf30a9cd939a084b92df486adb146ce2372916dcbd1108e567dbf6f729
font_02_sfnt_off0000f5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1