Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d18824ff59798d4…

MALICIOUS

PDF

84.9 KB Created: 2021-07-01 15:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 0ff2076cd2cd80fa2b567f97a7c670a9 SHA-1: 20ca6cb789b1e38eda2d7eef2baa341cd404d2d9 SHA-256: 9d18824ff59798d4bf37679c34e6eb6937e4f17681501be85bb5fbbd2919a423
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution attempt. The document body was unreadable, but the presence of numerous external links strongly indicates a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://fullcolorspandoeken.nl/userfiles/file/17608035280.pdf In PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/4s4906hj8q89mh1j6hn64u8f2c/64474273461.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bee18e5e77---3003054645.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0b3d5fa49---38310018867.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99dfa62c34---33448753410.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f944ca8b75---pebiderofuvisenoma.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/d75ff465df3da673dceb5a1be6826270/diliw.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6729fdccec---4974353352.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/bbec42f8bb948e94ebd76856a77eb836/sewawo.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/tli66rgop9ad1rch6c8gsjv0f4/vaxixadanadozajivu.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd7ebd98da---lovobubemod.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/73037616780.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0477007d---73334523817.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/8328949242.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/10497673163.pdfIn PDF document text
    • http://takemehometomatoes.com/ckfinder/userfiles/files/9985207234.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/30721222414.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/sureranupawoxesaluxepise.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/23uup8g2qgee8b3r0rl049mu6b/87636607683.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/8330701058.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/sql96t1kqo5j3ek50hfau7614r/ponifefeletiwugu.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/5e1b7913d58617320183648655a34d67/nidaxipamewituzokuremoxo.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/semibigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=an+amino+acid+is+to+a+protein+as+a+is+to+a+nucleic+acidPDF 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_off0000e6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C2 17052 bytes
SHA-256: 6e1280ec65eb5e594721290eeb40a0e630c3270bfa3a6554451061ff05cb7909
font_01_sfnt_off0001132e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132E 10756 bytes
SHA-256: 73f256740eaab2b0fff143c1c3caad6d205b3dd2996a78f84f026575b15b63b7
font_02_sfnt_off00012bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1