Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c58145621c2947…

MALICIOUS

PDF

83.9 KB Created: 2021-09-19 18:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cbf6eb7200afbc0c5aa86c7dfa4202fa SHA-1: 01820ca7ea4517bf607af618fde34123fd7299de SHA-256: 76c58145621c294748017347d621e1b6f722b17e33b2d952dee90dee0973e01e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a link farm directing to numerous external URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://gfwofficial.com/ck_imgs/files/34483790571.pdf In PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/xagewevoxedatekisudofuf.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/18743734901.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/c9585bdc9f9ad2a6715fe35b578195e5/ribopugivilirodibugugifak.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/vetawugofilisiwuladorolov.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/21894660226.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613626cd3d304---sumodo.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/76308932079.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/gexosiwuxab.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/xupodozaxufa.pdfIn PDF document text
    • https://birotex.rs/images/files/87481357990.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/nemexu.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/pufufopaviwadizolabonomet.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16133752b2c1d9---rimudepuwugadujifazipux.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/vezotorofumesesidizemev.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/57603749752.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/gitivekedemewo.pdfIn PDF document text
    • http://clerus.hu/files/file/nedeza.pdfIn PDF document text
    • http://prograsifkalip.com/files/7032568948.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/tiponuzule.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/28668539473.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/50946122137.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/wowemizivelazabereju.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/62942374274.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/kizejadisemadatoturaluk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=my+hero+academia+s5+ep1PDF 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_off0000e28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28E 18008 bytes
SHA-256: b6c9745dc512e70437586d5b3f01d35d2361a7d4fb31033323513657da26cf5b
font_01_sfnt_off000110cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CF 10824 bytes
SHA-256: 7c2bfadb1b53c51918ad22b79a1df0a7d35f38484d2454045d36226c2cf2ea9c
font_02_sfnt_off000129e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1