Malicious PDF — malware analysis report

Static analysis result for SHA-256 7280d70ef409ec2a…

MALICIOUS

PDF

82.7 KB Created: 2021-09-03 11:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d2db8cf40b88f9f852c04a2f19a5e206 SHA-1: 451a3598436890e5ce3424ea2d786d79a42225a0 SHA-256: 7280d70ef409ec2a546f500deb38b1b9b673c350f6184bff92589761ed9079aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for information. The presence of embedded URLs and the nature of the heuristics strongly suggest it is used as a lure, likely delivered via spearphishing, to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=chemistry+a+study+of+matter+worksheet+periodic+table+trends+answers PDF link annotation
    • https://zoldlepes.hu/userfiles/file/pavoruzesopatixu.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ea05299517---danigigadevokudoluwe.pdfIn PDF document text
    • http://s-moonlight.com/CKEdit/upload/files/79734499903.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abaf7e0e3c6---60664511102.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/mexaforivikiwugi.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075893f7a924---dupitetimonamosixisa.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/jutevamuniwobezeki.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/e0558b3970ad8b2756e6a5ffcf645a25/38186633890.pdfIn PDF document text
    • http://stonebreaker.at/retifitedodi.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160909dd87cdb3---suximeduvukufene.pdfIn PDF document text
    • https://np21bellapalermoshopping.it/file/xotojug.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/3092875909.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/83249948072.pdfIn PDF document text
    • http://yilip.net/userData/board/file/86469579412.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/lumikexewoxekog.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/gadabonolagaxoxirerekivik.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/99a8e787fcc980c3313e7cb3e056ce65/rolinegitug.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/ic0jdnj83d7ovbva3s514821ta/lifafedidivuvenefaxexo.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/vebivulowipemozeduzumon.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/31791013283.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a045b13b8ec---fukomamepubenala.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609143c6ab5d0---91319713490.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/99abf67808519037679b9e1379d6d79d/55423225331.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f623ee22a3f---73739687780.pdfIn PDF document text
    • 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_off0000ddb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB7 11448 bytes
SHA-256: bca5b01e54ae1165a203d69708a4c15d6f5389a954fd7dce54ebb906f602d6b5
font_01_sfnt_off0000f875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF875 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11087 16828 bytes
SHA-256: 47193ea31046791bf2d5916daca350e3addce9f7665607ac7156ff91e8818b43

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