Malicious PDF — malware analysis report

Static analysis result for SHA-256 5972c670df1eb091…

MALICIOUS

PDF

68.3 KB Created: 2021-09-03 00:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2955459bf378885d599a9b924f241357 SHA-1: dc2ba15fa8e69d4f87dbe7bbd817723a1e4cf3a7 SHA-256: 5972c670df1eb091ac0f1d179e3428f6a6431ce89ae8d2bf369b64d78416f24d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and small file size, typical of a screenshot hiding clickable elements. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://intemhathanh.com/img_duhoc/files/rubipawudanitigas.pdf In PDF document text
    • http://seamacros.com/upload/file/41866083235.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe1d9e1de6---kegafebudorironavoxofob.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/fuxozamupazimugi.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/dotedod.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/61827985972.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098a5fd313ca---10737609264.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/wipemuwuk.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/60553970593.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/61140933841.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c45cb966135ed2c6f05d92612d2a7042/vobavonifabovuzekibe.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/mexuwew.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789b981f4ba---11693053763.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/xejosuboguw.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/vanadogatuxiv.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a13e762506---getudowawo.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/4ebd008fffc0505d7040e30f9e6795d6/lurirabonawujebalokixo.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/42463398478.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/3712457424.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/42652229520.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/8fda0c5bec1e8de40e3ae6835231cf43/badifudakojokuzo.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/85677996818.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/bakagofapamufolabirubavuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=carnes+rojas+y+blancas+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_off0000b030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB030 10836 bytes
SHA-256: 828928e73cab1f2a2c8740f0f0eb9baa0a98d48ecdb731ce98f2d741c6e2bcdf
font_01_sfnt_off0000c91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91D 14076 bytes
SHA-256: c4cd089186e427ffd98f7d6ecb0177571e99cad8d81edaed1dac651c2c2b0f40
font_02_sfnt_off0000ebd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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