Malicious PDF — malware analysis report

Static analysis result for SHA-256 a642ac442e6ecf4f…

MALICIOUS

PDF

93.7 KB Created: 2021-09-02 16:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8f5247cef394d305fcafb838734a7216 SHA-1: 2cbd2f665d11c775b3614ea3d3712264215a9d5a SHA-256: a642ac442e6ecf4f275a92be302c73142e494a736475982644c072bd9264b462
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to potentially compromised websites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phishing lures. The PDF structure and link farm characteristics are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a41eb3310---ruwez.pdf In PDF document text
    • http://cukorbetegshop.hu/files/rabakifowuwa.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/vijevez.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/20415963694.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/v4fvpfijdqt5t52ekvkc5k2ku5/52352401573.pdfIn PDF document text
    • https://quaint-house.com/images/blog//file/vosuk.pdfIn PDF document text
    • http://innotack.com/userfiles/files/10799878050.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a52bb5a4d51---36281094028.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/pilabedax.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/mofuramekalerewumarozifo.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/71106805407.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/78304359628.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/sugabemexiluzutijav.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/527ec8b83499f72f425a889a81c872c4/vasuletanomojumirada.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/fugojakilewuzejasimuk.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/zazivexuvopala.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/95645137945.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/doposenuguveragasifowiso.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/9fb18b1f0268040795085305b55d6e1e/wekogozabozoweteje.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/she7g2j94m8qdi29b376bo5f8h/mujajusob.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611d976e3fc1d---34094585118.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/81352937910.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/98031604825.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021080818481879959.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/97579124747.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=visualisasi+informasi+pdfPDF 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_off00010ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA7 10496 bytes
SHA-256: de75cc239f549a44a3e152a8372ad32a079849d7c28923a37205759f3446f296
font_01_sfnt_off0001246b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246B 16920 bytes
SHA-256: 5e44fcc5da3a900e0e49213f1bc279b10da2c09c2a5db20a8365f1cacf6a1547
font_02_sfnt_off000150e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1