Malicious PDF — malware analysis report

Static analysis result for SHA-256 939fd74198a32eb9…

MALICIOUS

PDF

92.3 KB Created: 2021-09-01 21:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 27dd036e0687e530fc70c9f9a3741b17 SHA-1: 4642153f4eb9ce85fa6ddff82ebaf05f2ff813ad SHA-256: 939fd74198a32eb9d759180fe644b1e6bf824b6f05229d5fc8cc174ff5a152c4
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/5c8ab9435292cd815a976cec9da368a5/tosusomimomomurixizek.pdf In PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6bd5056b7---lexoguzomelotamir.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/rozetapefiwanenixewok.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/7cf573f1324f4555a44032f23a58193f/24649845250.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/84002683719.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acace6134ed---voxupe.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/banarew.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/96816907354.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/47405379780.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/9727170995.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/33kjlgi4tm25s7fg4j6s53mc6k/fixedonedizexafijoteko.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b161ff7ef1b---6535530221.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/10b0be11a35e3248f9f9bc878e3f962f/40951766557.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/lajuvojexow.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/62900985930.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160f9d1733d1ae---bogub.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a22a990d1a---jumuvekanojot.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a483d5c1dd3---95497070467.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/21618454309.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/15173560148.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/90516490081.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c8f03ef6b---lelozuzasuzuri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=microwave+transistor+amplifiers+analysis+and+design+solution+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_off0000f7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11006 11324 bytes
SHA-256: a1d637077aee4f30f689ab3189dd431309a12bbd9095457dfaf8897f674ee696
font_02_sfnt_off00012a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8B 21412 bytes
SHA-256: cafa21c34195c1618ee81d28590f08459533fc0cbca3764de010181e435b8e6e

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