Malicious PDF — malware analysis report

Static analysis result for SHA-256 987e72d557f6e1cb…

MALICIOUS

PDF

87.1 KB Created: 2021-09-16 06:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0149ffcf43b42b3dfe899d17f95842e9 SHA-1: 7895a195add261ebabb2ff115c6f82c6b17d70f0 SHA-256: 987e72d557f6e1cb89db7be2289a9c36cd2495b025b4cd75e7c2c37aaaceb684
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which are part of link farms hosted on potentially compromised or disposable domains. Heuristics indicate these links are used to direct users to external sites, with some being flagged as potentially malicious or phishing-related. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://medvor.ru/uplcv?utm_term=judi+slot+77 PDF link annotation
    • http://nusratali.com/userfiles/files/bifelilupebegikozes.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/voraxizexun.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/dfa6a8321206e1cd017dbf7f9d2600d2/navej.pdfIn PDF document text
    • https://cakkue.com/contents/files/nuweme.pdfIn PDF document text
    • http://clerus.hu/files/file/nedeza.pdfIn PDF document text
    • http://torgoborud.org/images/file/158224147.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/78614405867.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/17862613124.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/zojudaxapuzi.pdfIn PDF document text
    • http://lejuriste.ru/files/file/menukawakefekapi.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/1003084194.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/ximopowo.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/99061341214.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/89037995749.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/46131681353.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161334927d9e02---sedovaduxasulimofufiwe.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97188549356.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/tezixonakarozazidiga.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/zimipesovulejofuripaf.pdfIn PDF document text
    • http://gugugroup.com/userfiles/kimakano.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613724c9d87de---95349624294.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/kifegigi.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_off0000f455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF455 17428 bytes
SHA-256: b2fe8e14705259f1d4c1abec50500383e8463948cb4ce255ea1c1c8e4905fbac
font_01_sfnt_off0001216c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13982 9884 bytes
SHA-256: 6b7b827226d5b23ac71041ea76fd98edb4cb5f1c058006e2c7487778066e2b00