Malicious PDF — malware analysis report

Static analysis result for SHA-256 c081c3bfdf14a3f4…

MALICIOUS

PDF

95.2 KB Created: 2021-07-17 20:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cd97e2a6c5214c961a51d72f988d87ed SHA-1: 50dc20b30bf081a61e788710ccf5ad3759b6676e SHA-256: c081c3bfdf14a3f442dc87bb2ee8bdf4c68d9690dac270c5fb96f8b0b97e980a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://decoveinvestment.com/userfiles/file/14523103547.pdf In PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/614e253c2166b350a67a3dc6cfcdf3ab/zedipefomovaja.pdfIn PDF document text
    • https://shoreluxurylimos.com/userfiles/files/teliti.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/c3d3e12f7d93172f767e5c9d6f6a4df6/wonipapobaxurugapovuve.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607081498d26f---67681163251.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/89235a86eb666a83945e7ab7aa6e1db1/76142531346.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/lisitegovukarinopisafu.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data//files/nozuzok.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/doduga.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/26576278708.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/77021763649.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/gejevotolalinatubuxiwer.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/c561f3d522592fc62c66c84c44c25dea/vikawe.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16096267f44f0e---megegote.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/fudav.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/biniwogafovaju.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/73115256809.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160813cd38bb14---devegi.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/gdg933pln3nnih8u4fi68l6fe4/sefulebuliwesufufer.pdfIn PDF document text
    • http://furniture83.com/upload/files/muguwowibejezemoxijobanid.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160757c6d804b5---kujofejabonugonuwotudopu.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2e17132c9---1484733954.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/3daf83a40ee62017798aa28328fd0227/56517758530.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b6efa59b4---lonemerukevurig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=appeal+to+pityPDF 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_006_off00014fc9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14FC9 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_00_sfnt_off0000ddda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F0 9968 bytes
SHA-256: 55aa2622f6d17cb3a25e4aab43ed7a44604be15219c9848fa430a8c74897d0f5
font_02_sfnt_off00010c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C23 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_03_sfnt_off0001199e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199E 21996 bytes
SHA-256: e19574a2044f3ba5b089d4d899bd2f1afba71b7308fa1ba4dc7306023a01873c

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