Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a72500b0d1fbd4f…

MALICIOUS

PDF

58.4 KB Created: 2021-05-10 00:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a73bb7f8720cd1ff345939201d0f3fb6 SHA-1: b4dc5aa04068ddf0e5add93d4ee172ba341f7cb2 SHA-256: 6a72500b0d1fbd4f7eb2d2f5bae8fc840dde877b529d34c7cb6b35ef924b474d
154 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, identifying it as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised CMS upload directories, likely intended to redirect users to malicious content or phishing pages. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8253

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/78720363d6a4e9bb77565ad8cbd78d3d/3638210537.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9f34d1cc8---sokoferebegutisutujufu.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/49b3m5qhq6pb68nb3sp44b49pm/wikamomowared.pdf
    • http://anhuicrew.com/upload_fck/file/2021-4-29/20210429163638416920.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0684151f5---19455479863.pdf
    • http://iphysiology.ru/upload/98744641537.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fb4c0241b39a914ccfc9ddfeb305798d/99893913095.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/a91a0f6eb2545ad79f535c9d05f836a5/61921393768.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095d465b6202---wakuridabelopajebumevo.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2bd76c4ee---18625262487.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/94q0bceiv3ct98gql8mpgngjfu/kepuxofuvobaxil.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2e888969---60020182482.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160788c16e677c---faxadubiwetavudezigetiweb.pdf
    • http://yuha.be/_files/file/gibizewej.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbfb97af9f---vodexelapunevanafuviw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=atmosfx+witching+hour
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d650.bin
f62e717c5206eede8c0da7fbef714a894df3b8c0401ae4f0eef029dac273ab6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD650 4964 bytes

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