Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f25c5c570acc00…

MALICIOUS

PDF

94.9 KB Created: 2021-08-14 05:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ec1dd6063a6430309d8843739c7d1fd SHA-1: 6b47de318ab4d60f4674b7a3a28c7b5b3c0f3a5d SHA-256: b1f25c5c570acc00602f39bc4c51770e0df11084ded45c20302f8bace3db70a6
164 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The 'SE_INVOICE_LURE' heuristic suggests a phishing or payment scam pretext. ClamAV detection and ML classification strongly indicate malicious intent, likely to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://video-cycling.de/files/file/jolekozojivusujolax.pdf
    • http://2990592.ru/ckfinder/userfiles/files/44837974795.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097fd332f412---32251474181.pdf
    • http://wienbildarchiv.com/upload_files/files/66287129243.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/othfeqjbri4hinj1a5grru5rct/32447059483.pdf
    • https://yukkumpulgroup1.com/contents//files/lojexigutaronetofomizez.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160707c341c0cd---wosibol.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b083849bf4---2281596286.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c18233cecb4---fuwarazorog.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/68014dcce85f6b86f80e4b613affd6d9/67797802345.pdf
    • http://hitecds.com/userfiles/file/mulor.pdf
    • https://ipic.vn/userfiles/file/10671475545.pdf
    • http://intergeored.com/upload/File/2581540932.pdf
    • http://irs-messtechnik.at/upload/78660487334.pdf
    • http://guss-ex.de/uploads/fck/file/83158246362.pdf
    • http://copy2d.com/ftp/image/file/ganajatizoxunesusa.pdf
    • http://fitviewer.de/files/file/22821610480.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607e83e9e1786---2260457795.pdf
    • https://tonwen.org/userfiles/file/60897745240.pdf
    • https://fulzugaskozpont.hu/files/23401542912.pdf
    • http://psychoterapia-przemysl.net/img/userfiles/file/bugefizawazukodokomuvep.pdf
    • https://pgp-puh.hr/fck_media/file/19887098387.pdf
    • http://sungsam.net/userData/board/file/xenemovodolabumizazesu.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/b27d4rnsfhe07sf0i3n3iq3v40/3481994875.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=web+page+design+tutorial+pdf
    • 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_off00010e98.bin
8e454df0549fac2ee81a074201df4abde05de74e33d3e24cd76700deac13e0cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E98 17980 bytes
font_01_sfnt_off00013d42.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D42 16792 bytes
font_02_sfnt_off00015559.bin
cb0045b40e95afe6046d9acc042de36f45bbf839e14209d95a46335d4e026519
pdf-font-stream PDF embedded font (sfnt) at offset 0x15559 10908 bytes