Malicious PDF — malware analysis report

Static analysis result for SHA-256 907b8ac2138cd413…

MALICIOUS

PDF

84.8 KB Created: 2021-09-06 21:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 88be304336432b67f3ab3ba8e448df2c SHA-1: aba1bb3b05b670f837990ee1e282b19831b2ccf0 SHA-256: 907b8ac2138cd413e0cec9d537fee866566edcc7c0515224c9a9e8e2de2c6277
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a lure for phishing or malware distribution. The PDF structure is malformed, suggesting an attempt to exploit vulnerabilities or evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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
  • 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 https://chcial.ru/uplcv?utm_term=comment+construire+une+pisciculture+hors+sol+pdf PDF link annotation
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/2cd995f8071c9d680ef06e3033b11d38/80438176676.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/9146441672.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/dusixufolofabovaze.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/raxarenav.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607600cdf3e86---natidemigu.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/26711330959.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070303313421---8126264382.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/vemifezewidafonela.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/19376686828.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/bcbd5e01bab4c0bf3c06f7fdfbb5578a/81154344054.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xetirasejaz.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/97270564094.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/jikamaxot.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919051b86c4---tapafabekutus.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608191db2d77f---36615387643.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/fb29ff1cb71e6a7db004e19f130dc156/98281890692.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/sozuj.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/pelelurenipuposune.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b02bd0e4cd---wubiketivi.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/mufosebodifatem.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608753ea358dc---rojumonumorovudawus.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/82656011668.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/71398142204.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160822d10a5b23---jewurividasiruzizigebef.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/sujawujomad.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/tepakup.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/52209215431.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000e310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB22 19472 bytes
SHA-256: 89643064818e42db44378040bcdcfd5cec9f6620ebb0c2e587535bb3bc55b0d9
font_02_sfnt_off00012bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC6 10856 bytes
SHA-256: cb4b9b7eaa71eba77dbe6ab232f02bb03cfa9d21794cb7750ddf6eb6ebae7fc9

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