Malicious PDF — malware analysis report

Static analysis result for SHA-256 2111394e5043a7fc…

MALICIOUS

PDF

80.4 KB Created: 2021-07-16 10:30:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b8ef5e7ed2933fb74a51c39c5ff054b SHA-1: 435d85fe7e24148ea4e5dce390e22b5496512a7c SHA-256: 2111394e5043a7fc87fec1195730b4608fd783d096bd4354cff9eb68164eac09
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV with a 'Phishing.Trojan' signature. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress sites hosting PDF files. These links are likely intended to lure users into downloading further malicious content or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecade8df1b---6531500973.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087c2a1c1757---varuvuk.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0d02787b5---wanizetiganikabajora.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c25817940c2---43931566155.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806a489b1ca---fudixapolizobifinifakuj.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/bekedibuli.pdf
    • http://sy-smile.com/upload/files/fenebimefoxev.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-5-15/20210515161710218408.pdf
    • http://urgentcarepb.net/userfiles/file/kazeluraxir.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a94dc4dad7b---20056938160.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4e9450650e---furanovi.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e00a28e96f4---56363841007.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9337a2541a---89084815975.pdf
    • http://comp-art.ru/userfiles/file/xibojumesubitatibudijud.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160be2c37d4dec---piguvuwiwe.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/1b88isdmelm9k4ndfnra95svfq/kuwezukifalawinuj.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/47273709429c724de4e925dcf93c6847/73504990663.pdf
    • http://wannawwannie.pl/userfiles/file/zexowuxofaferut.pdf
    • http://centralgiving.com/media/userfiles/file/28655217018.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+disable+windows+auto+update+windows+10
    • 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_off0000e2a6.bin
86a94a7f6ed56f1c11005d43bfb8dc69019f2fb42d592c649e009f362998afa7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A6 17564 bytes
font_01_sfnt_off0001106e.bin
d7c2adf180c2e71e336c8c7b4293524cefd8ecf71204f1ab0d04188a3caf1b0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1106E 10776 bytes
font_02_sfnt_off0001292b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1292B 16792 bytes

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