Malicious PDF — malware analysis report

Static analysis result for SHA-256 2890a49e3fe2d27d…

MALICIOUS

PDF

174.6 KB Created: 2021-08-15 17:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 29964135e007a7fff2d14cb404777c55 SHA-1: a7d772dff59a6001381b2a216ab6d8b789cfb85e SHA-256: 2890a49e3fe2d27dc0d8c477dc7172aec63c872479e67b4097186835f5af1b2c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9237

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://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609edafc92090---95180700716.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/qsqud2s2l0lenjf6fuoodov630/rodigoretajavavekiva.pdf
    • http://changecn.net/ckupload/files/72850286101.pdf
    • http://abwessex.com/uploads/files/lorujuwafapotodu.pdf
    • http://win-sonic.com/ck_imgs/files/75314939992.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/vj6unb587g9nfcj7u6b4cajq62/29957969996.pdf
    • http://physocare.com/Images_upload/files/91016729445.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16076f903d9df0---bazebo.pdf
    • http://aryajob.com/user_upload/file/jokirokuranabopidur.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cb8ecf83b---64776940831.pdf
    • http://mrs-edu.com/sribati/editor/uploadfiles/gokobafajen.pdf
    • http://vyveva.eu/UserFiles/File/makamubadufibare.pdf
    • https://argumentua.com/i/file/sotanimus.pdf
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/65937006120.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8fbda4bb6---bolew.pdf
    • http://www.irrv.org/uploads/files/boninosevaka.pdf
    • https://daquin-ferriere.fr/userfiles/file/89269755859.pdf
    • http://elencostruzioni.it/userfiles/files/89163573893.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b13b2c7bd30---69831507669.pdf
    • https://shellserva.nl/docs/Image/file/47779785063.pdf
    • https://cowichanseniors.ca/userfiles/file/8178416978.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16078904437bb9---53167848736.pdf
    • https://balaji-technology.com/userfiles/file/fasofuxenisof.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/4733e40da500afe4fdf3cf539c421358/33428009783.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=reclaim+your+heart+yasmin+mogahed+quotes
    • 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_off000259cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x259CD 16792 bytes
font_01_sfnt_off000271e4.bin
622a36863a1ce3130599cec656a40c9452811b3c115ab99ee4df0f279c08a7b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x271E4 11224 bytes
font_02_sfnt_off00028b82.bin
4fe8c17b2f64776c5f1f43db76dcdf2ebe01ecb0036d351a9bdc566387b23f73
pdf-font-stream PDF embedded font (sfnt) at offset 0x28B82 17912 bytes