Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a1bb0ea1edcb44…

MALICIOUS

PDF

90.7 KB Created: 2021-07-21 13:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 914ff19506a10be9f36b2665669691c0 SHA-1: d5bd787f342fced77cca0713ced389c94f083df8 SHA-256: 77a1bb0ea1edcb442c4466b73b5b7d8c091737cee0b3524998cfc95b293ed6fe
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm used to distribute malicious content or phish users. The PDF structure itself appears to be a lure, as indicated by the heuristic firings related to link farms and compromised CMS uploads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609269fe56085---32205856914.pdf In PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088001f78f3f---27201058239.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/1rse9ol23bntvuragl45kqlkd9/mozufexaniberizekidigenum.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/4ba41cffa7de86386603b17cc2f2582e/polikasebatusiluxolebo.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/luminipitewewupuf.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/68751595433.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0848e9ecf2---58848883843.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/gireke.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/59449703358.pdfIn PDF document text
    • https://majubesar.info/contents//files/23509803464.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/9f044ebad336c41f9b13724d14e9abaf/87112961555.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/tijim.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/41971783762.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160add3c80df64---4735443207.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/shcnverj90uk7e0361rod24mcg/wifevebopexiwasakagum.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/92339176255.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/68973858856.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b53730b9f---8992488770.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/578560927018f395d05f65cf5dcf37f0/zofovepudesa.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/jigexafuj.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/17f710880b7f62dd3dbe8108ed0f1f49/29164007520.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=up+b+ed+entrance+exam+2020+question+paper+with+answer+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_off0000fc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11455 16736 bytes
SHA-256: 9743216736da0404dfa384217e2de12ff661e861c1d8eda90d5bfadabf30cdbc
font_02_sfnt_off00013ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFD 11664 bytes
SHA-256: 88658fba29204db3f5d2105f1fb8a86c87749ee6e3f0fd7f14c4356fe85f1d6a

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