Malicious PDF — malware analysis report

Static analysis result for SHA-256 835b9730fc68f4c5…

MALICIOUS

PDF

89.9 KB Created: 2021-08-07 04:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0f9b7fdbe1c823a093c4b10120e6a4e1 SHA-1: 31ae6899839c159679d099fedb2e8c8e4684110b SHA-256: 835b9730fc68f4c54c8fb7236ee248540d43f25d3f9264ebfc4e3969460f0b89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, such as the one related to 'bloons td 6 free download', are likely lures for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/e46b03b9d07a78dcb85e7809a5b86d83/ligena.pdf In PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160d01ab748371---rijozeboximorasodup.pdfIn PDF document text
    • http://smartarts.bg/userfiles/file/papolirozakomibariv.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nepogowifizeniduxesobeg.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/a2a236bb832119d4a8cdd59044e69ba8/4396917827.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/ded95c43b0b714a10b135ab8dd8058aa/80078765188.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/mawadijo.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/1241178614.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afcff72770---pusijetuborimiteza.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/womolamom.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/88070767826.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071c3322f17f---89494677862.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075577ada8dd---11072952311.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767a298c913---genomejopamezez.pdfIn PDF document text
    • https://edusfera.pl/upload/file/suwawiwala.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/96747794135.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4d16ef29---65248298177.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/wubukodawotesokuje.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/senijowepajawezodonanid.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160ae640529aac---324670619.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f85e8a0268f---zowuzufaregapexenok.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/63f6d9dd51ed224cba1bbea203599c37/90845143851.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/27805929739.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=bloons+td+6+free+download+ipadPDF link annotation
    • 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_off0000f70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70B 10796 bytes
SHA-256: 440e1c01c0f6780e3e5960d296fabed6c319cbd931cd08690c5b5040232af192
font_01_sfnt_off00011025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11025 18708 bytes
SHA-256: 1fb32bf3609a94df4018f5e94a3d03c0748bc83f5e889bea169b7d499b5e1042
font_02_sfnt_off000140a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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