Malicious PDF — malware analysis report

Static analysis result for SHA-256 8433cdb02dee3127…

MALICIOUS

PDF

87.8 KB Created: 2021-07-09 06:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d2e5422feecd0211741f70b90a29542 SHA-1: 01fe9dd241b98fa6b3b28af257e07fcad30a7163 SHA-256: 8433cdb02dee3127476e6167f84164d73c4de80302713165f8201a333e1cdacd
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The presence of a 'Download button' heuristic further supports the lure of downloading a payload. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/midiguzavozuruneginigas.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21dcb36344---girugosonuluvom.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160868beb935d2---mojedusomenowedemamif.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/76ae2125b03015837fd6a6975a4c5a42/17242109994.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/5563c8aaa6092810bf97e00b19672b0e/68623651089.pdf
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/70946786965.pdf
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/rolinotisemovijed.pdf
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20049901425.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1609b49c7b1a14---rovuvexelemawupa.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/265fc1d504f31c7135290710ecfadc7b/99279309693.pdf
    • https://autopratichesas.it/file/95588283017.pdf
    • http://porpora.info/imagenes/imagenes_contenidos///18274241799.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/aba04t4sj3gem1s9r8nisg0r62/81162133266.pdf
    • http://randalljroutson.com/clients/44711/File/10837455122.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/3c1n32q1aqlv47gakho7q7gf37/firaxulipet.pdf
    • https://daiichitravel.com/uploads/news_file/velamuka.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd0fb613a4---piwolisobize.pdf
    • https://samsungdvm.net/upload/ckfinder/files/74734729538.pdf
    • http://akcjonariusz.com/UserFiles/file/vufudixapebajofetob.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/sh7jv6nutb211o6ghaso98ghmp/zazofipumedigow.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d33aceca79f---24792081750.pdf
    • http://hyosangjo.com/userfiles/file/20210704025843.pdf
    • https://investmentskillsgroup.com/images/userfiles/file/kifej.pdf
    • http://st-communications.com/ckfinder/userfiles/files/37589993247.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a486660e87---dinolufitovevizo.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160757ce74db13---bomafogelowosovotevas.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/9fb096f06071d90a556d333d4c03d949/45031780849.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+dark+tower+full+movie+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4b6.bin
8734561fdcab754773bfdb2108ec89406effa5f6dd82d3b23ef617402ccd02d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B6 16920 bytes
font_01_sfnt_off000120bf.bin
68448fbf2b224c9a4479d9001ed19b2785deb92c98874aea302d5dcfa31d9d8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x120BF 10756 bytes
font_02_sfnt_off0001395e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1395E 16792 bytes