Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ff1e11dc74f6fe…

MALICIOUS

PDF

81.6 KB Created: 2021-09-03 01:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6e9fd9cb78c77c4c214bababfa61fc14 SHA-1: 3f7f1f5e37784b0888195de309cfde7f7452bad7 SHA-256: b4ff1e11dc74f6fe3458640f564753751c09c5d1c594fcace93fbff6ade4d037
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aacb3198a09---vozarug.pdf In PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/16a18d5c184cc8d717d7c0a300eaf87d/zupir.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090617b6c3f3---tizivawubomeviperole.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16129dfc657434---zopunijujizavafugar.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210704020041.pdfIn PDF document text
    • https://migger.dk/userimages/file/61388210167.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/74e4b7c3cb6861ed0cd40c34975f4965/sapewalewugosanelo.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b3eaff22d28---gikigimogufimakofes.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/tavegetevetewaneb.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/05bdd63c0cd48c44335618637ddfefa0/kiditidutukisigotute.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/tuxadaxuxerijeminukawev.pdfIn PDF document text
    • http://www.polni.si/Images/files/muvezevilawetiruz.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b0aad4048---45861305505.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/kufomivuronoxik.pdfIn PDF document text
    • https://soechi.com/userfiles/file/vurudutaxunugufeliziw.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/nebonajotajudugogalalul.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/poladezar.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/45059741745.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/fenemafokufijamiki.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/ralebute.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/99512146495.pdfIn PDF document text
    • https://halkapsikoloji.net/userfiles/file/11244384965.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/89992203639.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=crps+diagnostic+criteria+2017+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_off0000d5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD8 11124 bytes
SHA-256: f6788b6b338182e02bcb39a79f24e45db24d3939f76825bd32d23d3c26bd3c10
font_02_sfnt_off000107df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DF 18076 bytes
SHA-256: 108ebc33f2722c95b42dae79d5914a6a8eafca79a7ec95b0d4f213e4789d1221

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