Malicious PDF — malware analysis report

Static analysis result for SHA-256 da456622bdae720a…

MALICIOUS

PDF

68.4 KB Created: 2021-09-25 19:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9db12749e59b01e2f13dadfed092f881 SHA-1: 2df186379e301d6cbff9c1f35af5c3499753f7b8 SHA-256: da456622bdae720a66726dd3243666fd85a3e5e216c9ce981e9e97a28f63b5ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://garglob.ru/uplcv?utm_term=imagenes+de+androide+18 PDF link annotation
    • http://wedding-box100.com/uploads/files/202109050701092668.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/8722629167.pdfIn PDF document text
    • http://dzerzhinsk.timebank.ru/sites/default/files/photos/pagefile/bofixelukaziwimox.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/pigofodotuvetuvonulabo.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/mudedisuxotosubenabejapi.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/rumusawurezif.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/rasoxukumevadivut.pdfIn PDF document text
    • http://telangana99.com/userfiles/file/gezepiwoloz.pdfIn PDF document text
    • http://mlead.net/images/e/file/dejugara.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/46014568540.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/k6op53g5m5r2e5v31srfscs9nd/darigelupo.pdfIn PDF document text
    • http://dolonchem.com/upload/files/redewubebu.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/wuzibojubebofegaduwuda.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfc364aeaa---79205487154.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86504432228.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/19730846061.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/tevilozoruwisedofub.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109091351047260.pdfIn PDF document text
    • https://mollis.rs/files/673429928.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/puguxojotuvotid.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/258430cbe3e0ec903f38a26f088c28a1/26239496224.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/75641467043.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/14321410568.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/0f0ee210050243def455fb22dbc8f8b9/dizobamubipowoso.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/giwanadun.pdfIn PDF document text
    • 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_off0000b0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B5 10656 bytes
SHA-256: 4f75483deb05091f9b72985cb04413f76ecc890b5b3b487cbe29653941032eb7
font_01_sfnt_off0000c8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F3 14204 bytes
SHA-256: ed90439c1c3fbe847b568763752270a07d2c6d9e31b39d7744f238833bf2fab4