Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e84afade786f663…

MALICIOUS

PDF

85.3 KB Created: 2021-09-19 21:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fb61f371029cffcec5cfc78320880062 SHA-1: 65d2346445b03f33334d9e30c952d5ce20be99a5 SHA-256: 3e84afade786f663b1c0f5906d33196d72bae14539497c850e55bc4359e2fb09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=firestick+out+of+memory PDF link annotation
    • http://andreuma.madteam.net/ckfinder/userfiles/files/86763268502.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16146cc8804b0b---96281582838.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/zilidajafumojakave.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/74892351141.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/26629898497.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161429b90d8eb8---45957020411.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/62445190284.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/fixafep.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/55835883611.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/86012812996.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/pipetediniwu.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/tarakukenivuge.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/e9bedfdf985fe71220aef31492e62833/17884315874.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/wiworimefodagidugowuveje.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/36469288028.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/mekaxadokabuxojimo.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/joniperudam.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/99080538447.pdfIn PDF document text
    • http://skisun.it/userfiles/files/zisiderevikadonitepuwuf.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/nifodezevokagewerale.pdfIn PDF document text
    • http://herve-coiffure.ci/files/jovegofekuxudokotejidiv.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/85580630700.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021090751821_858030028.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/susekupo.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/giwafufefufutedozi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C8 18844 bytes
SHA-256: e4cb2dfecc5a884ab37ce61f00b0defc7159124f693f8a6214809e9abe1783da
font_01_sfnt_off0001178e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA5 10468 bytes
SHA-256: 95ab3b3e3a6dbdb057ea439b82e87fa53fffa2eb4d7b80c870adfe1a0b5df811

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