Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a3cdff6cd20444…

MALICIOUS

PDF

93.5 KB Created: 2021-09-05 12:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4a9189239028a478e050f7807ec85ebb SHA-1: d472e5fb74d26a7f8818ee78228795ce76fa477d SHA-256: c9a3cdff6cd204443fc12b61a1b87a2bb2d06f555bb200bb86d02e4f518a2abd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://matras-devison.com/upload/file/61675762145.pdf In PDF document text
    • https://lesfeesdelhetre.fr/upload/files/kovor.pdfIn PDF document text
    • http://sakem.org/userfiles/files/lozasedotovamunusedina.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609048868e265---17872595322.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/bidewutesopejomuwiw.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/giwutamududiguxi.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/15650986819.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/taduxuk.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/65687767457.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/wubegijawepanixo.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc819b16e7---97994405284.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/2d3339b268f36ea7b10f63b2e52930ef/wazowopisiwavolisopi.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/70e705b436a0c98fdd1b0fb703bd32e1/lozutalowinuwor.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/pejegetukum.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/71630351237.pdfIn PDF document text
    • http://bigredclassof1960.com/clients/879476/File/rerunebemig.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/kaxosotetazodepoto.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/jevefilunugokofonamob.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/aa7d5e3f49584d426c63572d1a914704/pazagumagekoxi.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/menepoxotosuxij.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/178fd5dd3115aea05bd444d1629b4a48/5163542107.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac422d1b3bd---45215065281.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/70180337160.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+solve+a+4x4+rubik%27s+cube+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_off0001088c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088C 11196 bytes
SHA-256: 6d666670d52a5f4338d95c1114cfbc2d8c2a82dcc54026af2fafd831a5e18d0f
font_01_sfnt_off000122cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CF 17544 bytes
SHA-256: 597764b307734ae740e664449ad07fb3b940b91b633bb1ba0308ab07223d0b88
font_02_sfnt_off00015024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15024 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1