Malicious PDF — malware analysis report

Static analysis result for SHA-256 c309bb916b640054…

MALICIOUS

PDF

80.7 KB Created: 2021-07-03 16:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d3813f872d0847b4a70ff0249f4bcd8 SHA-1: 57b71727a793d67606542e881313b4a6ee63bad4 SHA-256: c309bb916b64005428c03b7f8ed2a33203f4fdfd0d07f07ba9c364bdc0f4dc85
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 WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://rajskiewakacje.pl/userfiles/file/motomunera.pdf In PDF document text
    • http://boursemoi.fr/userfiles/file/59298888116.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741a0ed961d---nojigeviwoturafe.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/82ae140b3e5d2393901009225933dbea/51718037679.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/sufagogirare.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089cbd069251---jevowuli.pdfIn PDF document text
    • https://jetaime-shop.com/files/10389683997.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca56cf373---puxukajigomovelekigedugeg.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/ks00o4kk29l9vquhce893ddrgl/nerezitobagituroje.pdfIn PDF document text
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/76996886175.pdfIn PDF document text
    • http://computerdoki.hu/user/file/vezugegolewuza.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/niwovotamefekugep.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/65201716732.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/81989417296.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/79864097443.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cab61d432d---70661184733.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/202de2d2739f5f0a0b372dc50abb3713/22306875133.pdfIn PDF document text
    • http://midel.me/userfiles/file/jopedisuvuwazi.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609602700c640---49286366592.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/59466361302.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/42745874693.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/mafamakafekejumataw.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/66693572181.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c4ce7002a---66623689353.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/24810013572.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be696bd2f8b---laxopuwopijofijez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=human+biology+quiz+questions+and+answers+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_off0000d5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEE 11476 bytes
SHA-256: 5b3c8c4273a559cd5335ee3fb8956e9f17764ff74de8b430a746cad75c0fadd4
font_02_sfnt_off00010863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10863 17144 bytes
SHA-256: cdb66fe78d4c1264c1f97dbc8de4d4b2ac78e2ab3545019164afd7331a0045c7