Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d66bca20b6b81dc…

MALICIOUS

PDF

87.7 KB Created: 2021-07-20 04:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 288c17372f664302e3355aa3965cc0f6 SHA-1: 24751d5a5083a1ebdcd3a87428df7e36941b2ce3 SHA-256: 8d66bca20b6b81dcd86ee9bc01f519cc56a2a2481cd57d3b084362f7d952b418
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript further supports malicious intent, likely for obfuscation or to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b242dcc9d48---56086887681.pdf In PDF document text
    • http://amirafouad.com/uploaded_files/file/buluredasug.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/nawanadakugegaraloge.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/toxigenubebegedowuxumog.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/84391695398.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/memadexiposevigik.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c84d5b5dd82---xokolepinubaleponul.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f246bf2b2fe---xujapov.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/jh5fvon5l1gda3iqh9db9jtol4/69378425447.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/fazado.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/4d544972893ad4c47c02c80865223fa9/pitudi.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7c6a2f807---6299732087.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d6dfdf729---fuwamulajujerapovovob.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/2s2mtgo1tg8b5s7k395a933o0h/51211876963.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/b20521ef632f1c307056fd418972d0c4/87678731002.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/10997762247.pdfIn PDF document text
    • http://schokobrunnen.com/idata/safugagumudovuroxevu.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/sapesomexug.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/lekefevivadivito.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/14537679806.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfa06ecec5---makevonubovajavizawe.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a124d2063---wojotijutelu.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949c0c9beb2---91056379214.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4987859ab---papusejudogeb.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a5fe733a8---18738913278.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/tesadovezajavare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=is+it+possible+to+fold+a+paper+8+timesPDF 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_off0000f01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01D 18144 bytes
SHA-256: 7c6d9c6f97002c6d19710fac1551289dca376ac270650bbaccad19910a0aea43
font_01_sfnt_off00012035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12035 10852 bytes
SHA-256: 0d3eb1c218c028dfa8bf38510f9608fe70be245af637a2909e8a8e21fcc5f1bc
font_02_sfnt_off00013916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13916 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1