Malicious PDF — malware analysis report

Static analysis result for SHA-256 084f22403c3f3dfa…

MALICIOUS

PDF

86.6 KB Created: 2021-07-01 23:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d61777aa60ebe4febf185257cc930ef5 SHA-1: a482822d051054bf6463d74446dc968608aa44b7 SHA-256: 084f22403c3f3dfa6c1d212acfe81b6ad0934f8c14a2f7e4d58d877621a70dd0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, but the presence of a link farm on potentially disposable hosting and the use of UTM parameters in some URLs further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871a1680e94---20498082444.pdf In PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/36470255231f9270a1b445d500b030f6/18747729267.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087923fe3164---36994936003.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/55009cf349020cad08206055b5afc38d/21328839643.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/nawikuba.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/futitobizu.pdfIn PDF document text
    • http://1959blackshirts.com/clients/866684/File/janarez.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/ridapanakupevijuxasusew.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/megugizafevonugorinon.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/wawuto.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/7eb99237d23489215accc3c542f54c46/96200172863.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/2cfd805854fbf497df84d2852e25033e/81402793396.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/92731868736.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073569af18f9---83596199477.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4fcf57cdc---89377503351.pdfIn PDF document text
    • https://isleo.com/i_photos/file/53585701455.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/a16cc2b7c3318dec086d75ce60fb9db9/tesevovugexefimune.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/soqrjejue2p3cvpi4pvatpfl1a/welixixoludarelasebem.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bf4b0d9ea---ligikedijix.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/3f6spqicgsqk1lsj746j57rsii/dazosikavezi.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/77206372509.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/79078469260.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/905a6e335f6cec68dfce32aa5aeb7105/xegixek.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/lerexumubafagoreven.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=execution+phase+in+project+management+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_off0000ed39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED39 17336 bytes
SHA-256: e80f0f25b5cb2b392d9a9fc0f2f2a916a082725f01756a80891992263cbc0720
font_01_sfnt_off00011a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B4 11336 bytes
SHA-256: ed1347e8eaba9d2b32570372a18b8c63ffa3025f1f5eb03841b4ed3b9d832c29