Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddd654d93b66d333…

MALICIOUS

PDF

74.2 KB Created: 2021-08-23 15:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: fef7a6c289dce4ba71d483fb60e3cc3d SHA-1: 2f2ccd9c2bca373d973220baad3a17ee8d7d228b SHA-256: ddd654d93b66d3332559c71428e2328a1dd1e72f5eef547ae7f8e55f33d5dd9a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the nature of the document as a deceptive link collection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b16b1b3aa82---68141106028.pdf In PDF document text
    • https://alternativecarrepair.com/userfiles/file/36229272326.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/biwape.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/jitojer.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/62514490531.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/manodidamivubawemi.pdfIn PDF document text
    • http://jentretiens.ch/uploadimage/52720994673.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/fumowobekarisumenid.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/rp3ic2cd1s3h64v709vpi0tb7s/vapuwurawu.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/takevudaxofa.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/77349848674.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/gawajapodowifesafuretane.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/g74pjhjqat3ajlbsj4joteqe0t/rewegu.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/93389424293.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/fuzututavuzajarojikesewa.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/6509113856.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/saxugarugada.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/gopumaxokuwapofipi.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/jagukina.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/kejit.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0328e8d23---76337623702.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/61862442302.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=assassin%27s+creed+apkPDF 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_off0000be4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD664 10352 bytes
SHA-256: eed5316174395f2c2e841a422db035f55ae23cd528aa22f9130a510041c16aa2
font_02_sfnt_off0000ede6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE6 16996 bytes
SHA-256: 1d48b840c6665178121e130fbc1565eb2a2419b12f74ed3970da03a2181e4b1b