Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb38215fc03ea295…

MALICIOUS

PDF

89.7 KB Created: 2021-07-13 00:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d4e4ef2ca25a9e1b0d53a9babd585f78 SHA-1: f5afc7cf8f536eb16f3b0a51911e17f468225002 SHA-256: cb38215fc03ea29592bea8764132f3555cae2afa6ed5e9ee8de8050228ee7880
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The ML_NYX_PDF_MALICIOUS score of 0.999060 strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/8rliu7u5bl53jnotekiehhb1hd/34092699051.pdf In PDF document text
    • http://aldo-ins.com/userfiles/file/xifeforilepiwarivaxigeb.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cc47494a2---vopokigemowasajig.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/96008617964.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160805ea19cd40---41095214860.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/pasotubolagugowobuzanap.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4a879a870---gupejemosawimafa.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/5a8af319a4413828035171e6e0f187bc/32071578963.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/fanorubego.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/ab6d3f6ab0f3779f87e6362cc2f3414e/fasaxuxigikiruwapasijo.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/zivadusugebake.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e6ed2351d---gobiwimop.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b7896eedb---68481383744.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/bebvprnrvnf0jm8b13q8vk2r8s/wavelirexu.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/54434323415.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085665005de8---laxajeradejesoki.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5d0f183d8---14644441617.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents//files/juxepeduwir.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/nolavuwolosazedikoluvisas.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/28081860268.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=muse+twilight+songsPDF 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_off0000fc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001142d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142D 17852 bytes
SHA-256: 05f51ebd834fa19db6c2093b5ab78f46fb0b8ebaa656aca40ff3d4477085ed23
font_02_sfnt_off000142b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B9 10304 bytes
SHA-256: 82f417dd6b8dcab0bc5233d381e66973d1acdd513e2e9acffd7bc5ead16a37ef

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