Malicious PDF — malware analysis report

Static analysis result for SHA-256 253832e47a757e30…

MALICIOUS

PDF

75.1 KB Created: 2021-09-11 17:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 56b8b3277c82235fdba491fd7b24b25e SHA-1: 464b0c49afa492a7c6b64440bfc35db7c7bb4895 SHA-256: 253832e47a757e30a8776226465aedc4b163b6f0c6179313baa4b2153986a42c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or SEO manipulation campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://fultoys.com/userfiles/givuxibusevim.pdf In PDF document text
    • http://chnli.tw/CKEdit/upload/files/62596354114.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/sodikebuxipafuv.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/2598931137.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/24397862505.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/mexevow.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/zajigevekimeb.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/58596685336.pdfIn PDF document text
    • https://wonkingchina.com/d/files/sagix.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210906_AE884584A35F59C0.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/22254345256.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/g8ob570sg76gvd6dtm443qcr7a/35946186253.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/3305364268.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/11808380596.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/jiduwepapakewiratax.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109060348348514.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/89494160002.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/74482514952.pdfIn PDF document text
    • http://iscelenie.info/files/file/97818857915.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/pevoxe.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/zitalulod.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/sogajapepi.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/xipiwabuto.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139fb4657b36---35629323042.pdfIn PDF document text
    • http://fygl.net/uploads/file/0603100045.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316344c373b---werizow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=use+android+phone+as+switch+controllerPDF 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_off0000c2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D5 16572 bytes
SHA-256: 3ad4d21823ce568572a54e5b3ebc74aefdbf4563acc82fe25021300354925074
font_01_sfnt_off0000edb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB3 10704 bytes
SHA-256: b731d72a463a4c581e9e7b0270fad841ff5e518bd291d76237c62e3381d920d1
font_02_sfnt_off0001063c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1