Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ce5a9d5925c9897…

MALICIOUS

PDF

83.4 KB Created: 2021-08-16 09:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 805d4164a39ffb8c2a17ef94eb0bb591 SHA-1: 77a994315b8aaad50d41d51238e0c855a390a211 SHA-256: 4ce5a9d5925c98978912da243bcc3324a57cfa89731c75ced2830e4161d2959e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload directories, suggesting a tactic to host malicious files or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://cheers-gifts.com/userfiles/gafuribegamuvaraf.pdf In PDF document text
    • https://landatur.com/files/galeria/files/dalemu.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a96db491679---borotamalajipifaxunow.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161052a4420179---77905754628.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16076777174fa9---42690631726.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/japol.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210816/file/95982997403.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095712f94609---99366649282.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/toboloxegez.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d01ac92a1b7---mulozezijod.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/6d6532731e57ce19e04fe58deb857bb5/pamegewanexo.pdfIn PDF document text
    • https://pindimana.in/uploads/file/25553806820.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/83515131410.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085e9b397ffc---26092666562.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/91738524598.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021080822401043.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/91525143819.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/busepubosuvigagokoga.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/kefexudafedu.pdfIn PDF document text
    • http://industra.sk/userfiles/file/77148681528.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/d5d85e9f5a58fbb383a83353381e9a07/33375929048.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/zegojewatodanawugamivid.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/7285163963.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/3aa0e6db9f7d52a8dc47c9c14cb4db36/kofefuw.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/19264feb7a66d1c5f3920ca703fb21a0/55054249645.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=best+war+base+th13PDF 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_off0000e327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE327 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3E 10344 bytes
SHA-256: 12e5c3cd5a1caf78ef7350c737f3b6afeb04b69d985f6428ca1e1884bc84d9d2
font_02_sfnt_off000112ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EC 17212 bytes
SHA-256: 9e0f55b6c4dfbceedb498efee83c723d204aa338ccca75a660b2222632157eaa