Malicious PDF — malware analysis report

Static analysis result for SHA-256 c512d52fe1677a21…

MALICIOUS

PDF

109.9 KB Created: 2021-06-11 22:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3691d0aa777a0f43635732e5f6c5291b SHA-1: d6c9e2ef870703111fd9dba6e911755a84ac92bf SHA-256: c512d52fe1677a2182c526ff51b283c5ef9b958cf7c15be9345e2ef732219f28
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 https://drafthe.ru/uplcv?utm_term=maharshi+telugu+full+movie+download+in+isaimini PDF link annotation
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/d2le4f3baiotb93ct7c2r06nvc/27181875833.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/e25583af77399b0f5d970b4d78539f94/51498738813.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084c68ba14ff---45754692419.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/86992885918.pdfIn PDF document text
    • http://yongqingtech.com/d/files/1827861677.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a1301c3249f---84313522727.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0e9ca22b0---30193345469.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/e48267qom6qc95jd5k0i7i3vru/dezesiguxexefa.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609959a946e54---xonale.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/ki1h7rdqc68shnlo2n1t7j1vje/wofazovitisigub.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/48782390258.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210529210338.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609e030ac64dc---10684288432.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/juderibogupifupanowu.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e155639c30---62674888935.pdfIn PDF document text
    • https://avenue102.com/uploads/file/bidaziloxo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000134e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E0 5476 bytes
SHA-256: 85b1a72c42602ca6c363f6331c3aa6e8e20e0920d8112d835ac2b35c132b9fd0
font_01_sfnt_off00014770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14770 3720 bytes
SHA-256: 40ef96da86b6123d577d475be460de15c41b9ca7393a8e650be4e9942aa3c64b
font_02_sfnt_off000152d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152D2 11580 bytes
SHA-256: 7850749c6cb2521d182827b4ff7858e49e8bd806c5fc8716c053993bac9515b8
font_03_sfnt_off00017a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A22 16352 bytes
SHA-256: d7a740aed8bf2bd2fbb898a9a85f52f1ffa3da8f5a8b5cb21c466fe2b1faa861