Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb096186c44c1c8…

MALICIOUS

PDF

89.4 KB Created: 2021-07-03 05:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 523088473b4264f2d4ec9e21aafb24e2 SHA-1: a1cfd68d3eedec3f1658bdfcca7e4e01e477b030 SHA-256: 6bb096186c44c1c8049066c021aeb71732b21a6a7a8aad4bdfefb13480b914aa
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on compromised CMS platforms or disposable domains, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and a link farm structure points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://aiswaryamatrimonials.com/fck_uploads/file/xuwigilozakobemonuwewu.pdf In PDF document text
    • http://brlairport.com/images/file/naxemux.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cb6c5e62526bfb0d70423f387f5ebfc0/fusatedabizup.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/3793220518.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bfd06a4e7---45496541639.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f696d04627---51472284304.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077752c84fb2---81425240686.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/58025873563.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/dbf2cff67a706959b5f5085672332750/vusizudupagejilijarilewav.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/gulejakikizutigub.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/7549952884b515c83eef2fb982b2d66d/gexidipukamefaxitorafisi.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/56062319048.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e658307e0---12625871249.pdfIn PDF document text
    • http://zuche0551.com/upload/file/83115910324.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160822d3724b5b---fuxibogoxazozapuf.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/qt99ng1vsbbo4nhnjt39mtc332/63731161256.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/fonifesanag.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/giuboev47pbf28662vkgpr2sh3/96939749045.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/burugepurudemamivowofudo.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/49605402177.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/kajolupafej.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/tuximo.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/bubojo.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/34814885361.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/88925b02e9c2f08605c79bbd91ee4524/pipadamezuwogejadupeb.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/39799282298.pdfIn PDF document text
    • https://giovannicaputoboutique.com/file/gaxuga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=daddy+long+legs+most+poisonousPDF 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_off0000f9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B5 10848 bytes
SHA-256: 10ee788a7c4bbb8d5b29aec1b22c275444f17a1ab517f3c9052e6434a350a32c
font_01_sfnt_off0001128a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128A 17432 bytes
SHA-256: cdbf3b3ad0e79cac496b95416b471c10fda7a25d752a5067914b0cdfdc51612a
font_02_sfnt_off00014000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14000 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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