Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba706198ea7f92f0…

MALICIOUS

PDF

85.4 KB Created: 2021-07-31 08:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 24737b4815d390b605435cc95663eac7 SHA-1: b9d18a9cb36c6bd6d01ac9964946ec185a1891c2 SHA-256: ba706198ea7f92f0478d38a0a57eb3f5bdc0859a1eaa91ee1a4059d80d16ba91
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm, with many URLs hosted on compromised WordPress sites or disposable domains. The presence of numerous external URIs, including those on compromised CMS uploads, suggests the document is designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://hzdsbg.com/uploadfile/1627271381.pdf In PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/zibomorod.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/46245925842.pdfIn PDF document text
    • http://minipit.com/data/files/3624042790.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/5903e220aafd603bed14ac8fd67e9f16/vusup.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160857562c460c---duxodonida.pdfIn PDF document text
    • https://zzwgjx.com/d/files/rufezabagomubinafugu.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f56aac0ff57---44647943252.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/4agrbi6ebustl6akps8imndkd4/sikaluwipukosoxixesoda.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae830b432a3---musojazosetakizavegafazow.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/47165539758.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f3a095fe2---kasaxusiwaxarifubi.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/7644607716.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/bf116d10394b04ab1536dac11a7d1d35/rizosuwinojodoraf.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/jokerefaka.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb084b2501d---dituzujogidadiz.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607337d73a6e5---75428418019.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021719121435931.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/50201931250.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/38442809181.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/d4c3314c93ed77b07af199d5b8d38af8/ropufukuz.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/d1460e19dd7abfa0e6efe90f614cb94d/tutepuzizetezuras.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/mexibatasajobegomoxo.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/ftsn615331sd5h0a6efpimfjpo/menevegewax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=where+is+the+manual+eject+screw+on+ps4+proPDF 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_off0000eb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB13 11028 bytes
SHA-256: 730bacb88cb26bec278eeed3eaebcae7e63f8d117914d75b5c25330189bfef8b
font_01_sfnt_off000104a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB5 16616 bytes
SHA-256: 87b32bd3898251900e6db34e1a505043839955a734c01930d221f236e184f224