Malicious PDF — malware analysis report

Static analysis result for SHA-256 7325dd75962d6cbc…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 02:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 22c8feb0bd8d8fa7defc892fd447b9ed SHA-1: 5e929a075da79857b79b669e64ad49a3874a4995 SHA-256: 7325dd75962d6cbcfb68d2e6a76c74e2259c67739e071a74675d55c9b79da433
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as containing a link farm and pointing to compromised CMS upload storage, indicating a malicious intent. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded URLs suggest the document is designed to redirect users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://medvor.ru/uplcv?utm_term=moemon+emerald+rom+download PDF link annotation
    • http://gianniarnaudo.com/userfiles/files/8719792503.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/86271095987.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lawajetudekadelidaronuto.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/xovenegofis.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee9f0d991a---lolarebodasawow.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/48281499576.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/54524063077.pdfIn PDF document text
    • https://anaksemut.com/contents/files/xifijovamukolisa.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/35451715156.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/xejeke.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33886240062.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/nuwojulubesuvo.pdfIn PDF document text
    • http://cissi.it/userfiles/files/wovexazatizatirajo.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/6405913539.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/lanawovobezorududilaxav.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140bae672011---biputuzaruk.pdfIn PDF document text
    • http://emaaravm.net/upload/files/42722280751.pdfIn PDF document text
    • http://redactron.com/userfiles/file/kujegatezewofijarediponu.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427d2f70cb2---zukipogamegofene.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/jugapopewefinokupor.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9cc7a1fb4---zalivoruzujemopuvadi.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090416270827334.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/55058989863.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_off0000d7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF016 10132 bytes
SHA-256: 57d5c228b2d4aecd4e4172f53d56154942fc64ec5a89728aedfefc9db6df7d4a
font_02_sfnt_off000106ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AD 18964 bytes
SHA-256: 724a41a53608bbc63fb4908099151ed76d92c5d25d3efe86ad7ec58459b6e16e