Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b68b676b74f86f6…

MALICIOUS

PDF

71.3 KB Created: 2021-10-02 09:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 8a02720217055a13b5559e9afef71a3b SHA-1: 8582ec02e3861874fcf8257caaeb785dce15af3d SHA-256: 9b68b676b74f86f6d1d1284de491f4dbe19b1e1f22c1e7adc1d11ac917983ed2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://crewmak.ru/uplcv?utm_term=parts+of+the+fitness+plan+fitt+goals PDF link annotation
    • http://vasset.bg/userfiles/file/5823473315.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/58304360966.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/57426287813.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/78408862299.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/ponokoxixubipuga.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/9777593787.pdfIn PDF document text
    • https://ekransamara.ru/files/29488765210.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/51227201102.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/44627679058.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/dixosedolumulidi.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210912_33CAB6D0E7BDD355.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/vewekineru.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613520d4cc7a5---gomunodomezofilir.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/96365344504.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/pimotodawegarom.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/577mtf34hq0e9qeafs1eob0fb7/kamunapevogipuxikulux.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/84173330211.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/genorupit.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/71559553266.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb4012237---lizedanaraviw.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021093020433497.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/papexod.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/80460787168.pdfIn PDF document text
    • 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_off0000b315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB315 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2C 10640 bytes
SHA-256: 1972c3a453d600aa0f19ad3be9dd9f30b6355f7185bda2453c54eb322aa50d5c
font_02_sfnt_off0000e371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE371 17232 bytes
SHA-256: d2204e3a1adf47461734142b99c980e03a03cf25f253c85b50de02eb12b52211