Malicious PDF — malware analysis report

Static analysis result for SHA-256 f009a3925b93894c…

MALICIOUS

PDF

81.9 KB Created: 2021-09-15 21:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b3815ee37ab716c156f33820e118585a SHA-1: f6989c4545604abac8eec5b9ecf06cf787e8ad32 SHA-256: f009a3925b93894c5f315915f08e575a3d28ef6d99010895f5b6ca2f215b1c7f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs and a link farm structure, indicating an attempt to redirect users to external websites. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports malicious intent. While no scripts were explicitly extracted, the PDF structure and URI patterns suggest it's designed to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://krisoc.ru/uplcv?utm_term=gta+sa+android+graphics+mod
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/6ft4t20jfdegtoddqhgvfdorp5/gokavozunajagomoz.pdf
    • http://leadershipcareer.kr/fckeditor/_upload/file/64438142917.pdf
    • http://www.gonouvellezelande.com/files/71945289967.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e350eeb47a---43456530406.pdf
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/20117955023.pdf
    • http://mid-europe-ex.com/images/blog/file/94582282281.pdf
    • http://cnsgafgl.netsociality.com/upload/files/47772423090.pdf
    • http://cathugo-catamarans.de/res/wysiwyg/file/gerewuso.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382207260b9---jajolekadakukugugiga.pdf
    • http://szjg.hu/images/file/wazazon.pdf
    • http://onelove.cz/file/xoxukidagotalapirodetumi.pdf
    • http://otohondamientay.com/upload/files/nudebesajejaguxanutej.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16141397d4af9a---mefesud.pdf
    • http://boxethai38.com/upload/file/3554755499.pdf
    • http://daearesort.com/FileData/ckfinder/files/20210905_06F98BA1EB968CE9.pdf
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/bedetuzoseme.pdf
    • http://140.121.161.111/ckfinder/userfiles/files/69706293051.pdf
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/davadoxiwe.pdf
    • http://punaide.com/userfiles/files/gukipesuzedivez.pdf
    • http://lixupeng.com/uploads/files/27936125012.pdf
    • https://staging-info.sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/sojufibakulefopi.pdf
    • http://secretinvitation.net/images/files/vejesevugevawagotowe.pdf
    • http://immobilieninvestors.eu/userfiles/file/95284257325.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_off0000dc13.bin
e4c04f24cd10ccbc7f58a8334bdf974237bf493e5fa7404210a1eea2d5627d8f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC13 17452 bytes
font_01_sfnt_off00010944.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10944 16792 bytes
font_02_sfnt_off0001215b.bin
421bbbe16a5e2812ee9f6a74923ddcdfbae2c68995ac5f3979dfff4b9bbff64a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1215B 10824 bytes