Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61cc7c1f49901a9…

MALICIOUS

PDF

85.4 KB Created: 2021-08-18 06:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c680edafd91e242fd5c8db3ea736a601 SHA-1: d8995a11633715ec3bd78928b20eae841273a644 SHA-256: b61cc7c1f49901a9746693dbbae2b9de6a9a02b4997cb6d7fba93830c8d08f00
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier with a high confidence score. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating it functions as a link farm. The embedded URLs suggest an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://hydrem.ru/images/file/dabinugoko.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/5442faeaac3c0015190ed5f6b62e3603/28887264606.pdf
    • http://topspeed4wd.com/ckfinder/userfiles/files/73935895199.pdf
    • https://purmoradiatoriai.lt/images/files/robetekovuselumaluzexowam.pdf
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/89231144859.pdf
    • https://taperagi.com/contents//files/walexubikuvupatezo.pdf
    • http://agataklimowska.pl/userfiles/file/widolukebunemiku.pdf
    • http://st03.it/userfiles/files/24225990719.pdf
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/navutabilopinibel.pdf
    • https://glycocalyx.nl/userfiles/image/file/88653323194.pdf
    • http://yilip.net/userData/board/file/gozora.pdf
    • http://gshosnab.ru/userfiles/file/lubijobalizekesobaput.pdf
    • http://bogieclassof67.com/clients/71235/File/58923678618.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b993f40dbd0---susidozet.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160948afc97e3f---kuxawexonizobokivub.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/8be92261fdc2f8d71fe92ec804d7bf7f/12410096987.pdf
    • http://atya.eu/files/file/17825876299.pdf
    • http://seoulsquare.com/userfiles/file/ligafakitufijudabageluja.pdf
    • https://hiroyoung.com/data/files/lamuwatasudo.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4914d57473---winomanuripasubatu.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1610bb85f8a7d5---88342973047.pdf
    • http://bundoreh.com/fckeditor/files/file/jelekokasanetufufeniza.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6a82a7020---noxipixonopizenewebunifuj.pdf
    • https://accuratesearch.com/userfiles/file/xiwozasifunomizatepokaj.pdf
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/dapabavosamatekuruf.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+do+you+fix+a+noisy+whirlpool+refrigerator
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e750.bin
21d8f69669e7cc78d47540d2ff76debd985023c776a61b150b32333f89c80a08
pdf-font-stream PDF embedded font (sfnt) at offset 0xE750 16780 bytes
font_01_sfnt_off000112a7.bin
16da4ac7ed742e43c369831ca6070ddf78ad7b2f19efc1aa03da17420638f9c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x112A7 11168 bytes
font_02_sfnt_off00012c8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8D 16792 bytes