Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f2ed051ea4ef5fc…

MALICIOUS

PDF

90.5 KB Created: 2021-09-05 19:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3fbf6204399d753fea1562a3969b17f8 SHA-1: e36fd4e8e4626469ab7587da2ea35e52a7212298 SHA-256: 3f2ed051ea4ef5fcef210100d5acd6deabe887b1a31cb5f6d7c00a904215cea8
156 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 high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress upload storage and other disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/c41bc375a34f239415b3205ae40054eb/99467664274.pdf In PDF document text
    • https://muratay.nl/userfiles/file/doromiku.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cdbc392d46a---wuzutu.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/sulufukafebifukutikajej.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb5ca2953c---mebasotoxorunawik.pdfIn PDF document text
    • http://ubest.ru/images/file/josetokujiwo.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e94a3c241b2---69488234009.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c65d7ee02---44914600123.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/wosifipedelatalepilijab.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071592750b19---44226715055.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/6fm8e5jj5b5gevbgvpcklokjln/11949328383.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/fusezu.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac9556887c---85650181401.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/salasefanuw.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a694b99beac---4011901167.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/16124921117.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/vaxolopufojeruwoxunetetij.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/4005994640.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/8c9581bee51dfb9ccccc52444c04bdce/61674920646.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/43518117014.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/xedawuk.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16073dbb0ac933---moxeboxawofetuluzupelidan.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/jebawojizuju.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/48274587384.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-8-16/20210816193418180407.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/21638604126.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ruger+mini+14+gb+manualPDF 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_off0000fbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD5 18884 bytes
SHA-256: addf188be537f6b47b633485f49aae5d736972c554e36d39cffaf111408f9bae
font_01_sfnt_off00012c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8A 10480 bytes
SHA-256: e5e758cdfc7db1fc024031c14919a6222ca688ccd0932c55c10f47af52b415d6
font_02_sfnt_off00014455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14455 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1