Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb198b671efb415…

MALICIOUS

PDF

87.0 KB Created: 2021-08-24 05:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: af80e343712e9c639446ea5e7a239cca SHA-1: f01d72a698f7eb1da7a07c8053ef619daad4875e SHA-256: fdb198b671efb415f62a2802de8dee3056ace959c86fed5adb393cf80d65619f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, hosting other PDFs. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The structure suggests it's part of a phishing campaign, likely delivered as a spearphishing attachment, aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe294ecd7d---3045541707.pdf In PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608245b3d01be---40662182714.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/20584959679.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/fibigapitelubewemomedex.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/16325579090.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/22159103381.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/161057ac3ad042---28644835771.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ee82bd48f---31541490717.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e791108ee---66627948625.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/32365390360.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608291414078d---79598737498.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4fa7e407a---57484689904.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/49318583579.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0b149772e---sinazodov.pdfIn PDF document text
    • http://bociany.sk/media/file/68858309587.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/36733811661.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/medozumimataremitozatinux.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16121433ca370b---8301825058.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/daxasadufafarosul.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098880c631cb---jonawameweko.pdfIn PDF document text
    • https://trieurodata.ro/images/file/12777998836.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/xinez.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/14/file/20210514_000315_196.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/7qi4lvhjuj2rddbip3q4hkd153/19557420461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+clean+fiberglass+tub+with+oven+cleanerPDF 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_off0000f027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF027 11000 bytes
SHA-256: fe83046d9c5dee8cb12fd003362928a5ebfd67bd74ba791e126baa507eaaf92f
font_01_sfnt_off000109aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AA 17420 bytes
SHA-256: 3670de126045dba4ef6294026f5a959706d96a2c34771f10afbadac335890fd9
font_02_sfnt_off00013636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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