Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb775c942e084e5c…

MALICIOUS

PDF

83.5 KB Created: 2021-09-15 14:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 0c960c702cc01844fda14d6edba3b08d SHA-1: 50697019bc3d7ab441b62a25213db14c1bb0bbac SHA-256: fb775c942e084e5ceaae6269f0cbd2732a09b85ba51e67e38a2818584524a933
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to various URLs, some of which are hosted on compromised WordPress sites, suggesting an attempt to obscure the final destination or distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://shrlie.com/upload_fck/file/2021-9-10/20210910095813267818.pdf In PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131fa03dc656---zuxajikijumunovapize.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/53139805868.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/41121506586.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/79f3636f2af3424e09cfa90d1c513c63/xofurib.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/kevobuw.pdfIn PDF document text
    • https://isosklo.cz/uploads/52855307609.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/faguvurebuzakobegitapoke.pdfIn PDF document text
    • http://datcat.vn/2018/file/21370950401.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/34376164403.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/xomufukeva.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/29726782996.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/bopijadowuv.pdfIn PDF document text
    • http://snft.ro/media/file/76322687031.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/52255220732.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385c33c48f6---4414454639.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/98485707280.pdfIn PDF document text
    • http://renknh.com/ckupload/files/30010615940.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/42764405269.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/87109719510.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/xopibojizotuwanejodufi.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/84766610164.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/kuwatekikegipetiparedi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=kodi+on+firestick+updatePDF 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_off0000e144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE144 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95B 10748 bytes
SHA-256: 54d716bdd9b05d589f69260904eb3ff80e7838e0c1f4e0b5681fa2d2f770ffd4
font_02_sfnt_off00011233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11233 17552 bytes
SHA-256: 0447fd16d8e4cf7104b2bc4d6953bde863fe25bb06c781f15c3f6a91bbcc9fa9

Open this report in the interactive analyzer, or submit your own file for analysis.