Malicious PDF — malware analysis report

Static analysis result for SHA-256 34929d746188ce56…

MALICIOUS

PDF

81.6 KB Created: 2021-09-13 23:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5fcda35196044a9136525718eab8b609 SHA-1: 9b736b48bb183d79df3c458b196cffc4cdafaedf SHA-256: 34929d746188ce56b9dc8eb5802cdda385701aeeab0413944945d885ec533dd8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of external links and the nature of the hosting suggest an attempt to lure users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://xn--90ah6akb9e.xn--p1ai/f/file/xaxobibejikasadekir.pdf In PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/saxelosapukinapitib.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/42192018777.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/mupojuxalivowekuxewiled.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/4fis3rkeg7bo9qad35f4upod2q/84658857555.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/81545391180.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/24210138301.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/vuvoriwejilipitex.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/11536689570.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/finefurepini.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/73809801208.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/sumematat.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/89566646960.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/pejumizugemik.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-1/20210901100423361429.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/6361571861.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/99924737902.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/77492497950.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/sorufewasezivajoxojofuzas.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/64644773555.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161311fdf5b5eb---57970106304.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/dujixusavuru.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/37742299546.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/texatoratebikute.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/xubik.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7c61dda83---92090520420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+lock+my+phone+without+power+buttonPDF 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_off0000d92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92E 10832 bytes
SHA-256: 289d9b709596ee144e192d5b0ff11fddb9f570e664af5e71d514abe8108e0f48
font_01_sfnt_off0000f1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D6 17976 bytes
SHA-256: 70f05bd7a3e73e0f5b63acd29f8ab9b538f7ae6e1e98f464b16c74e6f07feb7e

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