Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c70e8477dbb6e51…

MALICIOUS

PDF

85.9 KB Created: 2021-08-10 18:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 207f2a3dcd47faa2fac87ab8c965c474 SHA-1: 56b7ba0150495c16aa5375c680caf74b4ddb37fb SHA-256: 1c70e8477dbb6e51bdf35d6fcd3ec388fc5ad42e645774c3146ccda7ec181299
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://kibunajcc.com/ckfinder/userfiles/files/keseveroxemoresinez.pdf In PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16084d2f712158---28666690878.pdfIn PDF document text
    • https://ambalatender.com/upload/files/65059721821.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/60899813784.pdfIn PDF document text
    • http://timecraftz.com/userfiles/file/fagamixamep.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f88948c0a---40890663014.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082192790850---gowaxokizolixovoxopore.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/gomalolemupek.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/p8rc2ofqkksegf1vbov8u6dklc/puzomuvifiger.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/fajepemosumazelobevaguja.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a7172d709---pezenonanuzokudopadebojo.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc7de45ed4---95072452588.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/25778738095.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/20411096008.pdfIn PDF document text
    • https://servicepapik.ro/files/relabukigenopafa.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/ib6mkdfakrs1d5ss3u6s7bgdp7/samifinol.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/b8065e0fba14447205adf45b9e07234b/selifijixobukeguki.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083e16f96c50---verurekul.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/wirusodewujabeze.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/24d0685b53211fde66c3983e0ad231f5/tubakutusuranogamupetabup.pdfIn PDF document text
    • https://papiratisk.cz/soubory/rudusixaboxowetelusolaz.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/pakusomoxuremipetupi.pdfPDF link annotation
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160baff5ce5d8f---sinososeluwoximizowuromi.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0c45290a79---nixapajedum.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/derujawipiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=%C5%9Fim%C5%9Fek+mcqueen+1+full+t%C3%BCrk%C3%A7e+%C3%A7izgi+film+izlePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9A 19064 bytes
SHA-256: 4e985068f36e4b284b37f7e70a0434a93ca197d3ecf2be9f7c2e428606454cab
font_01_sfnt_off0000fc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2D 11460 bytes
SHA-256: 0906995fdd473986fbfbe9b156ac86a02b4963901a3b3133777b0ba0da0ef366
font_02_sfnt_off000115f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F7 17112 bytes
SHA-256: 885b9024a80bd539ee88f4c17c1e1fa3cc6dab475ff5b740ebf17c73a317c9ed
font_03_sfnt_off00012edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1