Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa98968fc457474c…

MALICIOUS

PDF

74.5 KB Created: 2021-09-06 13:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2a25f51a72065f2ee8bf3d4db218fb9a SHA-1: c5e36b72b2202841a8381c8e7418fef5739305a1 SHA-256: aa98968fc457474c3f09ceff9e5c9dc75e3f0990db3895d41f3f0609f9f4167f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to various websites. Several of these URLs are hosted on compromised WordPress upload directories or on disposable domains, suggesting an attempt to distribute phishing content or malware. The presence of multiple links and the use of compromised infrastructure point towards a campaign to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7613

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 http://ohappy.org/userData/board/file/35708025570.pdf In PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/99600871172.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/velufozobomolenenopim.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/62673181637.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/fumutotoxofefomulotevej.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/e56ecbe024fa261bb1f6a51f9b8c5929/22353892835.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d905bf3e2e3---48931354604.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119209a3950b---54380717056.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/ditubajub.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/85507151643.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/uto85sufme9g2hsd7bfl43aqh6/pesarineribakilisu.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/34636803257.pdfIn PDF document text
    • http://sieuthibds.net/images/files/83646439933.pdfIn PDF document text
    • http://poiskvod.ru/images/file/lakojonujowepid.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16094d32535611---39483241880.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160715d8c8a695---mososisasixisikuzip.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/sezekofabebunufidifasirop.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/0e9e385c0e6925f6c701a313fe14e156/64352145351.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16076ec67a1686---86037488310.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/86103803212.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/c805fen2cpumggr1g1djjs4gle/duvaduxibagazo.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/32910786783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=delta+sigma+theta+membership+application+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A3 17188 bytes
SHA-256: 53a404d0bd86b4d6213ae1ad61765fdcfa900fc840f342cd8966c43f7018b663
font_01_sfnt_off0000f583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF583 11208 bytes
SHA-256: c3d1b9340a556c07e1d70bd2db00a4d8f3034fae12e7b34ce6655b98e511a709
font_02_sfnt_off00010f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1