Malicious PDF — malware analysis report

Static analysis result for SHA-256 28fcde9cacb92230…

MALICIOUS

PDF

93.2 KB Created: 2021-09-08 01:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: eddf1b670f1b4221a90f547869b1fe1b SHA-1: 4da3773c08f95a33137a69f06e5a30150d2f78c8 SHA-256: 28fcde9cacb922305ce82cfb1db7ed0618e08437d834f807d911bdec8f095468
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 0.9965

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://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b2295d9bb89---81268139435.pdf In PDF document text
    • https://accuratesearch.com/userfiles/file/17002068295.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/36p6bp0imne8172qcpn7sgdder/22910534535.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/rupotarokewokarigo.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109022032361217.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/37772974289.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/28329408412.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/limotozus.pdfIn PDF document text
    • http://email-database.info/userfiles/file/67615274595.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/sidebosopimuxi.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/1a5935dfc98cbf22c9218cd2f28aa2aa/funaf.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/6cdc2856ba64df72caca67ab149a1fc0/fazuw.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/fiwofebaladalu.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/66572500974.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160917e49e9db9---40352485784.pdfPDF link annotation
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fa8c683853e---55782374318.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/5fd2bcde639483da2836700f759954b8/58096074247.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/j6temj6gf7l6g6smi0hmjcpufc/58694235806.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/93438398851.pdfIn PDF document text
    • http://bereanbaptistashton.com/clients/1/1c/1ca8668e480cca1e897b6add33210fc6/File/89745539004.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/48185069373.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160846da7b0441---zogavet.pdfIn PDF document text
    • https://xistenze.com/files/files/46095806945.pdfIn PDF document text
    • http://iccarrentals.com/files/file/78712983634.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=dgft+hs+code+2018+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_off0001051d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051D 18700 bytes
SHA-256: 4b82d017fa693a64d605e5200188063928f9ded1854d0aab54e8dd742e0cb4f3
font_01_sfnt_off000135e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E3 10896 bytes
SHA-256: e7d9aee6e5f490bfa329baa0d86fefdd207bd1fd8701343f02c9157b6f532f50
font_02_sfnt_off00014f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1