Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f2fb1b300f8416…

MALICIOUS

PDF

112.8 KB Created: 2021-06-29 23:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b8e7d33f6309f146f8c1f65dd4f3c6f0 SHA-1: b832808f843e2947a61390599dca948b4459f2cd SHA-256: 87f2fb1b300f84164caedd75ec5131090b7c20fbca1a7d8a46ad933e1b3dbaa9
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9698

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b213a2e0c---46563986305.pdf In PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160739e38ed88a---32802622786.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b6562b59f---89624359728.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/464946ab5faca4aeff6169d2684675fa/61731724069.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/wosisida.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///92444457412.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/207f6343776b99cbf6e5cf3eb957d49f/devamodubuxax.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a027829e6a3---59165081103.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/45748753206.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/vezojimodulimas.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de0a540fec---venazigamutubumonufa.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/rovipasafega.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/kn0fcb6flskm28jmp8j09m9luq/ruzejoruzuzok.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202106file/2021061400414670554.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609acd0a0eb82---47154064594.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c994235da74---luxezerakasinumimoj.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/c3c49af4139d933f7865b861764c18f4/gibibematakafa.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/8ki45rcrg6lm6op6h0j5ris9n3/novugupasa.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160befa75c0eb2---subopewidowo.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/97527290233.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/lataj.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1227e31822---6282715185.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e455798b2f---tarafubaso.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/4631443528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=my+sympathy+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000fcac.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFCAC 24012 bytes
SHA-256: 5a6ed95ebe7e69d84aad66d51602d6eb40830e51646732de83d6534fe90985ae
font_01_sfnt_off00012b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0F 30764 bytes
SHA-256: 78b7dc7ad2e5d8863ce0e71e525fee92ae2f5c577d3b049a02384eccdc65dd59
font_02_sfnt_off000171b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171B8 5208 bytes
SHA-256: 4ad2fddc131f24227519b6db25d502d6c8e5494ce85b99a2c88abb6693c2cf70
font_03_sfnt_off000184e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184E6 10540 bytes
SHA-256: d2cfe0ebe1acce5bf9334ae9f41ff9d459f5e4276bb748ed916455bfdcb62e78
font_04_sfnt_off00019cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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