Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f4bc29380fe25e…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 18:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 23f4bd8d17e5662fd152068ed8a1d0cc SHA-1: 7b56b81ab34207ca7772121c8c059761224a4342 SHA-256: d8f4bc29380fe25e8f1b9096e8b1123be14954708a44da35954bba0b598c7e2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The presence of numerous URLs, many hosted on what appear to be compromised or disposable domains, strongly suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140424db2859---20665198245.pdf In PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/61444730070.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/nefimutulazawawobad.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135a8129627e---9911543686.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/80270179707.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/59779103420.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/wagoxuzunaturiditaveluluz.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161457096eb156---21392299592.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/raruzamonebaruxadelaralo.pdfIn PDF document text
    • https://creativekids.abcedukacji.pl/web/uploads/files/resuvikisizu.pdfIn PDF document text
    • http://autodilygood.cz/files/file/rafewudawugoriwone.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/gujevofivalawiviteba.pdfIn PDF document text
    • http://splogservice.ru/content/files/42741762214.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16144be5ca62fc---tefixog.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/44923549820.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/69772053756.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/610ldb6ojfpnsa7sb0lsljklj2d26hak/tuxabasevilasuvam.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/bevop.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/82589344545.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e358537840---67380865128.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/balazogogigekuzuvamep.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/65028133882.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/87099263849.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/6327564550.pdfIn PDF document text
    • http://someteme.com/archivos/_20210909115312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=live+cricket+match+on+mobile+appPDF 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_off0000b18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB18D 10728 bytes
SHA-256: 057e010aa88a0d28d9c93c55d5d71f13635f7c250afe8321d125edabfe79d323
font_01_sfnt_off0000c9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BF 16104 bytes
SHA-256: da480df181500c3da0b80b4468dee3664a2c6ff2698f2c7b657d3930df00fc3c
font_02_sfnt_off0000f2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1