Malicious PDF — malware analysis report

Static analysis result for SHA-256 2155f351af20d557…

MALICIOUS

PDF

82.5 KB Created: 2021-09-02 16:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 79b332b553a48edfe77f6439ac0ba23b SHA-1: 29347ffc77c02a38b9553ad80c3c6eba0116fd38 SHA-256: 2155f351af20d55756f06cd59ad04b28522ce65831136dfd79d10873d5ece080
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, which in turn host further PDF files. The primary purpose appears to be directing users to malicious content hosted on these compromised or disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://cihangirhotel.com/upload/ckfinder/files/vugigatopaxe.pdf In PDF document text
    • http://grandp.ru/userfiles/file/zopalatara.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/20001144218.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e77ad2045---putokopokila.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/n5uj5dcdk81rk93ujtj4pvdnr2/52215315795.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/793e0956ec56c73104ecc95b65ec0285/33770724113.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/g1ogf9ct4o4cf0e56jue4ub3fv/66575837460.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608920e49be21---15449210561.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8b76f751e198eff683bc2ffef13e7582/tanefif.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/40132671207.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/ce2b78bd1f05eac2bb02bc87c3a7a4aa/38525606508.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b04ebd662d3---40317204773.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/36060001588.pdfIn PDF document text
    • http://lovesenergy.com/file/fewudamuxanoviromewif.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862b2e04a20---kelilisibeveridebugafek.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a6eebd82b---bozutomivanizibuvelowak.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210605064355.pdfIn PDF document text
    • http://coalcreekcentenary.com/clients/5/52/52f735e63eff8706e1a2a73a20aef632/File/zazoxegadolukapuvadu.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/wezoxizifilitevux.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/61380327345.pdfIn PDF document text
    • http://firegallery.ru/img/upload/27417997813.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/lesutozefi.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16098bf6aa3324---geluzovutususore.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609689eb19cc0---nunipul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=hcna+exam+questions+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_off0000ddae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAE 10976 bytes
SHA-256: d92a37c47904d3b35cbd2a01cd76e44c225d8567101107fd1bc650be8b36763b
font_01_sfnt_off0000f6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F1 17412 bytes
SHA-256: 64e011099ffa759d26e14446c340636cb759a9562c82cf9616d085a03d5897cd
font_02_sfnt_off00012432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12432 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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