Malicious PDF — malware analysis report

Static analysis result for SHA-256 40979a2c3b276ecb…

MALICIOUS

PDF

93.1 KB Created: 2021-09-18 14:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 20fad9d6b42506a044b531951a077201 SHA-1: 77170560425617f98451cac4cb49cf0aa16600b2 SHA-256: 40979a2c3b276ecb75e0c63bec448121e0f6d219e09287128ff1e1c70c5643aa
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of a link farm on compromised CMS uploads and disposable hosting suggests a tactic to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://synerhu.ru/uplcv?utm_term=negative+word+that+starts+with+e PDF link annotation
    • http://auburn-properties.com/userfiles/files/tapukojowizupu.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/kajejezufinasifuzugozi.pdfIn PDF document text
    • http://agmapure.com/upload/files/xakupusivigaroseva.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/73258544950.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/38567968301.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/7989ddcd0846f22ec71b66b643c3290c/65338019168.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/gofiboleworobafe.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/3957292318.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/50211040568.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5a097e3cc---febisowozegamunogaz.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/7892353178.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/nabaxefura.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/87f83d67d047e677a5d578c6e0719cd8/zedivaxaxofaxek.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/34179767811.pdfIn PDF document text
    • http://unseretochter.ch/images/file/82901867316.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/49340056359.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/bivesifibigezapuzelulova.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/banufuxolasevuzed.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/sataxupowujad.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/koxubusazudoxigabad.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/sogexilexiwudodunelada.pdfIn PDF document text
    • https://combrooncom.com/contents/files/guxaponozak.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/sozedugitila.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE6 18156 bytes
SHA-256: f120b3a090823c65a8becf249b7c20120a038d8658b5b6683fb2d7a35732971c
font_01_sfnt_off0001196a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001317b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317B 18024 bytes
SHA-256: 2ae8d95e2f85dfcb271c8eca0e62e3608d05cf164eb5a989630eea31740fa50a
font_03_sfnt_off00014dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DFA 10504 bytes
SHA-256: ed8d648ff08ac5b8b190618f21746d425f0ac95299e218c0a9f7e4a40cb24475

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