Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc9476bd2871af9e…

MALICIOUS

PDF

82.2 KB Created: 2021-08-22 00:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aac91417ae172b7191297ba4d9c4988f SHA-1: 0ca67e390a63456994cac256c1fd813c5e2a3ca7 SHA-256: cc9476bd2871af9e818b2b2b51c8f50c30dfdb65b83650cf4b690e1d46e7e235
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm pointing to compromised websites. The embedded URLs, such as http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608febcc0d163---xelesiwemireramutizefixu.pdf and https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/ee25b93ecc193f9e7ad98dc84578de12/lidod.pdf, are likely used to host or redirect to malicious content. The presence of PDF-specific heuristics suggests exploitation of PDF vulnerabilities or social engineering within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/ee25b93ecc193f9e7ad98dc84578de12/lidod.pdf In PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c92ed591106---28061650060.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607754b50ca07---fabozuv.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/5880dec3e97e471387e9d3fedcb10bab/30757024589.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///sebuzolujujuki.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/8914110655.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a97351f33---fapetot.pdfIn PDF document text
    • http://grandfiltr.com/files/file/46297833403.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/c77b570dd8048f1c2b4da21a911f9dcf/vetavuxivefekobebepifened.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/68735678104.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1965b5f757ba13293192ef7fe611413e/67044324324.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/47181082092.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/gobewafikopokilupulaxu.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89d2ccb1d4---39302645938.pdfIn PDF document text
    • https://ibextrail.com/editor-images/nemibutisuzixobeke.pdfIn PDF document text
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/taruxuwulusekipove.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b3f598472---buvizuwako.pdfIn PDF document text
    • https://chineseclothingonline.com/File/nogilozi.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d0c6c5f1b---kosagokutorulore.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/4406e99363dbf392cd9f27276af30b9b/65137453472.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/dudojasubewedemunuwipi.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/62874448239.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/16b86c47fc914d966db795aba48ae79e/linadefevirum.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///20644039322.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f566bce3fa---jegolag.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608febcc0d163---xelesiwemireramutizefixu.pdfIn PDF document text
    • https://sealskinz.ru/files/file/zaletekojuxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=worksheet+for+class+10+maths+chapter+wise+pdfPDF 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_off0000df0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0B 11124 bytes
SHA-256: 69093b9d203e89f2c1b29f8b6f04aa7efecf95e09b9460a3de27f6883433fcfa
font_01_sfnt_off0000f91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91F 16008 bytes
SHA-256: 4099480070e13ca74c7cecef4e7b496a75f4028e99bbcdc9f2e92d41439d65b1
font_02_sfnt_off0001227f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1