Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ffea29bcef3c85…

MALICIOUS

PDF

91.8 KB Created: 2021-06-28 22:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c057b0d1db6bf6aeb2717c30ea6f1b06 SHA-1: b4eb44cb737cc9251d87f862298ff7d04b4a2160 SHA-256: 63ffea29bcef3c85dce2255d031f26006f754636aad57453dd3a4809413b4df5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://queure.ru/uplcv?utm_term=nordictrack+a2350+user+manual PDF link annotation
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/fokasusalawasibo.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/0c95k68d8ib0pr9ns5jp92ltt1/xevabizugozopuzikiwujubog.pdfIn PDF document text
    • https://paperland.bg/uploads/file/nojivarelif.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/4568c17b3e2d40e36d7d98504258352d/lenado.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/zekeruzufonuxuw.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af80893337---92554152958.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b37372ead0---wuxedebazinasonokefosisi.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/vapenef.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/joleginulesozifubal.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/tojmrvi5r1j357iif9jju01iaf/53262487243.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/86705773694.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/b7fa5eb1a9bd18155e4bda1a53a4d3af/78132607345.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/13118602844.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c63dd4cb89f---kowuna.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/wajivusap.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16095a3fe899f5---zixesijufulu.pdfPDF link annotation
    • http://kcntanduc.vn/img_duhoc/files/mekokujujenidedonige.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160ba90a333850---399461905.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/ieo0oort68tad0ca219idipce2/3711777509.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/xogafekukujajofelazanive.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/53163820255.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/83390308973.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/ropuxujutujoruxunakeze.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FE 17764 bytes
SHA-256: 0d615409e286621dd636c5498697e61a00099da3ee99d4aa7be1de20295ab779
font_01_sfnt_off00012f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001477e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1477E 11248 bytes
SHA-256: 0b83235d2a893d0ab2dc5a75cb41dd2bf0da5eaac49bf8ab40e7969aa0c2a1ba

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