Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f58a60288b664c6…

MALICIOUS

PDF

76.3 KB Created: 2021-05-07 00:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 476bbe63362bdff5f4b46aa286084ad5 SHA-1: 31e9369364edc40a2eac5c89b165f2f8b7d3c95b SHA-256: 2f58a60288b664c6acdb185b4ca86c1eaa98a73f222f0b5ff2ace1ab1e31dffb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or credential harvesting attempt disguised as a technical document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9554

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/de9e25b518b20eeca7c91818318b1e6d/38918994721.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608cda0a98962---20543221265.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607715885bf64---51956198882.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608149b7cbdd1---wekiwirizuwuxe.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/4b2e63e3ac31ee84ce952f1186872b41/vodawurofe.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/307c3ee875b691e89b0b20fec9c3f6de/kakuruwub.pdf
    • http://alarcon-v.com/editor_upload_image/file/nudewikaribesegomu.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/ddn39ulb24ajlir2j8mt28ol4f/nobuxasadaturudalu.pdf
    • http://www.deopendeur.org/imgUser/file/lulefovi.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608667fd89c0e---17757265445.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/39879533ef6f96ee2ffade713b9a2fa9/lawubekaj.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/2bbcaf9fdf2cfcabf7b04b9832fd3ebd/vivilekaniwufapifesumekar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=cisco+unified+attendant+console+installation+guide
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0dc.bin
305a38dece535f86ba594acde9f1c48cb2ae9c22e00bae7144dda8905a7a1f43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DC 4608 bytes
font_01_sfnt_off0000e11e.bin
b232c73d1d03f76014834a35da2cd30caf6d05e0e0fecd9a0d1cdbc1e8a7c026		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE11E 5000 bytes
font_02_sfnt_off0000f236.bin
2d8cd25c5a915376a17b61f9623e45d2a2a94a0e60a15b066e109a519c1a7188		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF236 10680 bytes
font_03_sfnt_off00011717.bin
db7f4f0e8e544b85db003ee829ff0169084a52a17835106aefb05f211f0286c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11717 17440 bytes

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