Malicious PDF — malware analysis report

Static analysis result for SHA-256 916951bbb9db63c1…

MALICIOUS

PDF

84.1 KB Created: 2021-09-01 03:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0b38de595f0375175c6c4e7414d648bd SHA-1: 08337867bd8faa75671fafc408555f46cd2fe8d5 SHA-256: 916951bbb9db63c191874ab16da9c5fc59c214239ff0bc665a61e0c183ed8e35
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised WordPress sites and other disposable hosting. These links are likely used to host phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://drafthe.ru/uplcv?utm_term=control+system+s+chand+pdf PDF link annotation
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089efbb3da32---xerikejebumenu.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161108a5768a5f---64246895133.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bc5fb9bf5---pezezukevofivudiv.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/c890242736054fe4561ab3280e58b0c9/momuzituwowuz.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b6506f230---rozuloxexunumas.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771e393b3e1---60537965414.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087057379612---mowegisiboxemudukagofoji.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ba76bf810da---78491969653.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/gefigudavutekesufisara.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/70610127211.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/dr09at26mlmfeuvgaqqaivd1a7/galenetozawonixiwub.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cfe2d90eb---37781249125.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6233e9947---56625505658.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/vusasazipexuxo.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/nexifi.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd0aadb47b---40415118834.pdfIn PDF document text
    • http://foodsafebox.com/ckfinder/userfiles/files/fawazavafugemewituwosifi.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607164b4094f4---74656145992.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lepalawutesedexubeti.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160931e0bd2e04---wedilolinebuv.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/fb71a4fa0fbf8ffbd99098439dfe6f3c/10556365850.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/1dd1e8e145e976d0c9d3b10009760e01/raduzoxelipagevixinaf.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/pavezubevakizekexamuwekex.pdfIn PDF document text
    • http://forresterfamilyreunion.com/clients/c/cc/cc72bfd2512333311cc1ef5a4fdef90f/File/totegeviwutuderotajom.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611b7ebc0479b---jafonukolelim.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/45092272747.pdfIn PDF document text
    • 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_off0000e6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DA 10940 bytes
SHA-256: 38031aac97049b942ef0fe458434c4fcaebc8bc3b54ffe52f7d48b3e4206e0ca
font_01_sfnt_off00010017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10017 16124 bytes
SHA-256: e0c2495dfa1d0a0e31a2460e823ddc1fb0e0be4707e0ca5fc9fd7f53945021ef
font_02_sfnt_off00012958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12958 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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