Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fcd3dc48a240307…

MALICIOUS

PDF

85.2 KB Created: 2021-08-26 06:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5b934cd3393f5471469d472b45849023 SHA-1: 183d13dc2db830e8afa0e07d04c25005c193e343 SHA-256: 6fcd3dc48a24030715bb584163de508f151097a8f17e47a22c9760ff772867a5
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c3bee0722---13323526825.pdf In PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210816_201417.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/nigajakad.pdfIn PDF document text
    • https://kartplast.com/resimler/files/77598852014.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bfc814fcd---45321318622.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/2d89b70981873b8e1bc02ea83914b2f3/47773277232.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/76791574001.pdfIn PDF document text
    • https://andana.us/files/files/gomeko.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/11ed772b2859e1855d24ac382cd86412/76083866944.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/99730940309.pdfIn PDF document text
    • http://pinxedien.net/upload/files/xadovixokuxeluf.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ehv7f4cndp2c4nor1ea5gn4hb2/gigeselowekujeju.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2aae4d3fe3---24021265892.pdfIn PDF document text
    • https://ancoraeducacion.com/images/pimopavofukudejisogepenin.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/55917742615.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d8eddb166---pawefugugulidi.pdfIn PDF document text
    • https://digireg.pl/upload/sobotofabik.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/bs04j02v9fqro8tgn6uqg8hgv5/33799415389.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/bopijezu.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/190024245972.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/tavaxuberefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+addition+rule+statisticsPDF 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_off0000e85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85A 17428 bytes
SHA-256: 1e3fbbc6bf3252b6375c1b6f0368c22cc48adcb3e6d09db804ab55d382d8bfa2
font_01_sfnt_off00011630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11630 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E47 10532 bytes
SHA-256: 28045a03efda15f2e4356b44baa51c961071155f113be7a5061f2215d6361ae9

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