Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f05e57ab25c6758…

MALICIOUS

PDF

77.9 KB Created: 2021-10-10 03:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b173c8ea761c7626250d6316a1d7172 SHA-1: cb7a533598c0e9f84a1b9c55f5cbe5431c8fea69 SHA-256: 2f05e57ab25c6758f8564616a1c052421d5de0e23b865674bab84dee7903de96
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains flagged as link farms or hosted on potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or malware. While no scripts were extracted, the structure and URL patterns suggest a phishing or SEO-based malicious distribution tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://unicorn-furnitures.com/d/files/pitifojutumivozuduger.pdf
    • http://kientrucphatloc.com/upload/files/8524098524.pdf
    • http://insei.eu/userfiles/files/49128011974.pdf
    • https://lescourailleurs.com/upload/editor/file/mezolejemajafa.pdf
    • http://easyliveconstruction.com/ci/userfiles/files/mawot.pdf
    • http://discus-rus.ru/upl/file/jaguxofopapepusatowapugem.pdf
    • http://ahzycw.com/upload_fck/file/2021-9-16/20210916065748381920.pdf
    • http://neurooperations.com/ckfinder/userfiles/files/38655041727.pdf
    • http://www.photonics-science.com/ckfinder/userfiles/files/ragigapujizabukeki.pdf
    • https://granitabrasive.ro/editor_up/kuxavatojebukefupux.pdf
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/fanuxesomovojozaxilakix.pdf
    • http://viettelhaiphong.me/data/dulieu/files/sewar.pdf
    • https://bipalisdemo.dashindonesia.com/userfiles/files/jipadobimunelexe.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614556a062c7d---79029377326.pdf
    • https://ustunbilgisayar.com/userfiles/files/30605267968.pdf
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/23206332918.pdf
    • http://lor-rostov.su/userfiles/files/6924338191.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff6b1e0185---xabenuxojemapurepobo.pdf
    • https://radiosmile.hu/upload/file/mizumid.pdf
    • http://1night2daytour.com/ckupload/files/gowalurusat.pdf
    • http://mayinmaunhat.com/upload/files/66777940674.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614be39d5b025---toteravu.pdf
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/32731125439.pdf
    • https://avistravel.ro/userfiles/file/pinifivavudelepubava.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=vitamins+and+their+scientific+names+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccc0.bin
3eb27ea0f0ea7462d5a088d4ce197714a7516cb9c4dceb7a0b9a6f81851083cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC0 17260 bytes
font_01_sfnt_off0000f941.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF941 16792 bytes
font_02_sfnt_off00011158.bin
2eb703483a6eeb8daa8db605df22dd651336babb1f39221ed72a794f765f900d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11158 10688 bytes