Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb70a5c9e80bb3d6…

MALICIOUS

PDF

90.8 KB Created: 2021-09-01 05:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: f321d5f89898619f03f179c15524252c SHA-1: 3c23b6c3da4b619095ba792d48fbb948dc010e19 SHA-256: eb70a5c9e80bb3d6ad75a34492f8d9982b4b24ac519cd9ab54cc4ef2f545f03f
156 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 0.9973

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://tw-go.org/files/bipixenukotide.pdf In PDF document text
    • https://interconformity.ro/images/file/71300376720.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/nizegomom.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe1da315990---tukaz.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/wafusalumufuta.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/cb7c2e68c64d5183b459cc8f8aee712b/xesilo.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/82421920065.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/resarivasilatasezeg.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/siveminupurazidiwulizaxas.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/83581558043.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609081908fcfc---wobidefesipufun.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16078c6d136bc8---57322030179.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/wanizajifijinexidujurida.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210831055321_560271415.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/51503625449.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/97439567033.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69294448413.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16121c0cfad29d---pekovobikifoni.pdfIn PDF document text
    • http://dogable.de/userfiles/file/54480122622.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/86covti00tfn4bhnhpu1obui80/kevelefenivuna.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739e84def77---jezanojozejajulafa.pdfIn PDF document text
    • https://orangerun.re/photo/files/sokawanirise.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1611fd748c3a6a---kutedepex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=oh+come+allPDF 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_off0000f366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF366 21892 bytes
SHA-256: c274c4a8433d455b45da3fd05ff86aec41dbbe2f8f5e3763c751c8ac05c1a6b4
font_01_sfnt_off00012d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D27 9960 bytes
SHA-256: c3d4b34c8baaac0810f950f91ffab85ac9da4d8d73e60b1043678f2527cdfe0e
font_02_sfnt_off0001432f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1432F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1