Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c6eac5aee6e1a9f…

MALICIOUS

PDF

85.5 KB Created: 2021-09-12 02:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 48b17c44e9c9602d9ef58d55afc7a4d7 SHA-1: f38d5ad3bb726233f35b8f53231be5ebb342b187 SHA-256: 7c6eac5aee6e1a9f4a79f1e2124bf3c20c1b10e5eeba645b4be9151ec3c01415
236 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of an advance-fee scam. It contains numerous links to external PDFs hosted on various domains, many of which are associated with compromised CMS uploads or disposable hosting. The primary attack pattern involves luring the user to click on these links, likely to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://xn--3bsx3iw22bmot.com/filespath/files/20210911202209.pdf
    • https://ensegun2.com/ckfinder/userfiles/files/93255376327.pdf
    • http://vngo-cc.vn/cooker/public/files/rutob.pdf
    • https://beautyyaurient.com/editor_upload/file/veriseloxixodu.pdf
    • http://mevlanaasm.com/resimler/files/39698844546.pdf
    • http://c2r-auto.com/uploadfiles/file/2021090800504173499.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fa5cdcbd6---kivaribefak.pdf
    • http://polletnv.be/uploads/files/51601898076.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16135e6407a05b---fufubibonasujotonana.pdf
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/61359050119.pdf
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/lilad.pdf
    • https://vietnaminsight.biz/ckfinder/userfiles/files/38758908019.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/83icv1jnh1915firrh4rlau410/wijedopo.pdf
    • https://ghadir-eng.com/userfiles/files/26031078885.pdf
    • http://flomojapan.com/upload/files/wugepifudu.pdf
    • http://rasciindia.com/firetech/ckupload/files/47404390315.pdf
    • https://kominove-centrum.cz/media/files/file/pixexapewajusitowadidedon.pdf
    • http://ongxoanhdpe.vn/upload/files/41702031311.pdf
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/48240678697.pdf
    • http://wsmr.us/userfiles/file/tazipenoxa.pdf
    • http://architectureanddesign.it/userfiles/files/wizabidefa.pdf
    • http://sunnyten.net/userData/board/file/51621328703.pdf
    • http://lutechmed.com/Images_upload/files/94757589471.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+export+sms+from+android+phone
    • 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_off0000e892.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE892 16792 bytes
font_01_sfnt_off000100a4.bin
0ce1ca77477a423b1928eef167d4a94d240c53990b3126806c355b370319192f
pdf-font-stream PDF embedded font (sfnt) at offset 0x100A4 17832 bytes
font_02_sfnt_off00012f32.bin
8572ac41fbc845fbb1145bbdc41a8544c839cedc3e76978e16bf4bc3f9b866a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F32 10896 bytes