Malicious PDF — malware analysis report

Static analysis result for SHA-256 805978176727638d…

MALICIOUS

PDF

92.3 KB Created: 2021-08-18 02:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 664109f7731bfb8e43f6812685092526 SHA-1: 9772426bc9cfb462ea830dc686f0bd61c0682bf6 SHA-256: 805978176727638d5ef7f12e91372522de75ef9eed484a793fa4822ce61c7839
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9673

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://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/dfjk0nsernotfjjfqpt0ifhv75/50514575961.pdf In PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/5r84b2n9pa0dfprg6vmobaivl7/jupeninovaga.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/sidikuxubinojijunijo.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/35348196355.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/pigaxozuluzawibewam.pdfIn PDF document text
    • https://sealskinz.ru/files/file/719725365.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1890c455a9---kadimosavowulozutibofog.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a936ca30efe---7926807636.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/kemagopovetubosebejifej.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/28843788994.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5af864fe45---remuze.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/15022853979.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/gezikumow.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/sumig.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/makenavam.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16102d6f26b444---1403246137.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/83465379093.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/32706966587.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e280d0572c1---jebuwowivozinopoko.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/medivod.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/8fb9dd391d56e63abe498a65c614b9aa/doxiji.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee3d6bc283---35631775429.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/7531454627.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c7b7c3bdee82f812a3ce9fb779dbe759/lutigojisasenexe.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/b3cd3105uckmblt81gqou2ft30/33266169675.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609826c900682---mekawepegokipifozufusonaj.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/2c87aa162ae636575ada9e270481e2ce/74260543468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=ravenfield+beta+8+free+download+unblockedPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB8 11040 bytes
SHA-256: f0c1150c89d90b1bb32368d66da7bae13c5781ce93faeb01abe79c7c1869b2a8
font_01_sfnt_off00010794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10794 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA6 16968 bytes
SHA-256: 2d8141a32b18682bce2d4eb5d290a0511e0b226606ceb1bbdda89c6ca327fc96
font_03_sfnt_off00014b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B8B 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467