Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dfcdf752efbd5f6…

MALICIOUS

PDF

93.5 KB Created: 2021-07-04 07:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6c58460f3b774906bb746890c5460ed3 SHA-1: 06ae14553e6508b4a827cbf5c2829d7abeafce04 SHA-256: 6dfcdf752efbd5f628928016bdcaf968b3769243ce6ea7ac559f9a6c010fcfed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. While no specific script was extracted, the presence of embedded JavaScript streams and the nature of the link farm indicate a likely attempt to lure users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf508c4a76---95474156534.pdf In PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088362e75ea4---tofinadutimakomapirafof.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/74781989108.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/55883614555.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e25426beea---badupajewepekuf.pdfIn PDF document text
    • https://sayurmateng.com/contents//files/nixiwanasomopuxalodub.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b24da276b24---55998747132.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/vigujozipalitozaku.pdfIn PDF document text
    • https://go2germany.ru/files/file/gunokaxon.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/95033318830.pdfIn PDF document text
    • http://www.uniformsolutionsforyou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d08b094b67---bofatowarodarinuxinujex.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1e33b5946---kekug.pdfIn PDF document text
    • http://aven.su/userfiles/file/2716920962.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/0atog3vd2mqcdkafrje1nn879q/13059419173.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/22918162585.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/51335214262.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/27758417074.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f74c288628---44813342514.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/84046473878.pdfIn PDF document text
    • http://farmina.ru/uploads/files/duzoxalitoj.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ca3t93rn0mn81t9hv9dejqnm2/71724962278.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/7ip9hrtj3j8ir6noessnplhus4/14515347636.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/95e54c3c08370627ddb7c59c982f8a0c/94057366076.pdfIn PDF document text
    • http://imaginove.eu/data/Files/70501351895.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/wunosaxumotaxeruriwopuxe.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/fixix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=god+made+you+for+a+purposePDF 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_off00010b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B28 17924 bytes
SHA-256: e95ee0ae48f4ee3b298a5f991e2b48e8c90833335824d2adb07925c10515ec66
font_01_sfnt_off000138aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AA 10572 bytes
SHA-256: 2870b629e25951a70197d9d5e9ce1e4f1a1eecf59e54874aa1d024b021abd489
font_02_sfnt_off000150d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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