Malicious PDF — malware analysis report

Static analysis result for SHA-256 2feee378d6fd3ac3…

MALICIOUS

PDF

81.7 KB Created: 2021-09-13 06:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 66345d1e6c68a107e43bb0f933e5d0d8 SHA-1: 16d5e0d732d9a200ba1b8e5e91506a8fe9e559d0 SHA-256: 2feee378d6fd3ac3e89ccb517b9e7e0dcc80b8991d79280bfd9efe23d97059ee
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous URLs, many hosted on potentially compromised sites, supports the classification as a malicious link distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb4454c0c0---linavebuz.pdf In PDF document text
    • https://muguet.fr/sites/default/files/file/76649143721.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/71754561155.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134e30933c00---setel.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebf681f51a---75437642632.pdfIn PDF document text
    • http://cudicio.it/images/file/32740193612.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/baxudorodorufotikumoviz.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/fovufexiwokud.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/50783360931.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/56313329111.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/41571498611.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210912100633.pdfIn PDF document text
    • http://lamay.de/userfiles/file/nowaxuzumat.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/nejiwe.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/loziwawiji.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/f7e8dc21bc98948f78392ab55bd50294/72387380475.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/59783755818.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202109/1630471482.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/bejedidunixi.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/14200220289.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/30791766861.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-05-21-21-17-93.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=top+100+metal+albumsPDF 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_off0000db8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8D 17732 bytes
SHA-256: 308ad10135b9b4d8aedfc547d4a31c0c4649aa36450428703b110b89c56469b1
font_01_sfnt_off000109b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B1 10492 bytes
SHA-256: 78629427a41d61f375061402d8de09b140cfe8144b14bfeaf51f7900ea98d3c8
font_02_sfnt_off0001216c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1