Malicious PDF — malware analysis report

Static analysis result for SHA-256 f574c47cd4af05f5…

MALICIOUS

PDF

75.0 KB Created: 2021-08-10 09:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 613ba5302396c53f0d4e1a78f2bab651 SHA-1: 66f258fb72c81c7c1b635a6260b34c02e748b00a SHA-256: f574c47cd4af05f5be383b2d01b2c071bd0956f5ac648ce789bca692b6c2eb0c
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. These links likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://chanakyaaerospacedefence.com/userfiles/file/modapu.pdf In PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/1hlthdgm2ie5lqbk6psgoe3deh/29535110998.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7cd533d5c---gujurafewiz.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dffc1636b9---rigovojosezopikunogis.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16087df51d5f31---89397868498.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210623_BB8B451E248999D3.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/fogedowatakaxofesonona.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/giwemetilomazasepubiwa.pdfIn PDF document text
    • http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/jaxamoxolemojupoke.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/ferifanejupinaperewe.pdfIn PDF document text
    • http://cepsagibyachtfuels.com/images/photos/18097916680.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/likuziwane.pdfIn PDF document text
    • https://webhosting4.net/media/file/43746123475.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/b5813a007a033f59337858dfacad5eba/75917760324.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/fopujezadenaboj.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/f8bced838b43113baa3f6d283776d7b4/30881952167.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/9d2a61f5b606c79df2e908e88a35f7af/xutavopogov.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddb81d1ad8b---4540662115.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd4b818792---wajujifufoxal.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/32320568420.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/i48c6j16gr8hor1aentb389hah/gesezafojup.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210722235348.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160999faf4a96e---teritererujibapetosevezo.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbddc4c95f---wobinubideg.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acd47e81a7---tegexijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+add+staples+to+a+one+touch+staplerPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/9275de6a6192f4faee2422e895469eb1/65255742957.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_off0000c338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC338 10696 bytes
SHA-256: 4795b45aaf828bc86780258cdc6caad4dffe567e4210719528c45a8ba10e9e8f
font_01_sfnt_off0000dbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D4 15708 bytes
SHA-256: 2774486f29e57e7feb8afbb6055164909162e0c93961b9e3b654553a74b8e95c