Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1516f2cf7fb11e…

MALICIOUS

PDF

90.8 KB Created: 2021-07-19 09:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: ec2569807c87a3bc20cc324269bb47fc SHA-1: ec16ec9281a6e005688e886265043e50a55feecf SHA-256: ef1516f2cf7fb11e9e4b53581a986c214d6eb4a00f414b7d9ed48f12a2e67db2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users to phishing sites. The heuristic firings indicate the presence of external URIs and link farms pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute or host malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/0f700mhb1c4r6at4ipt5f2hbft/pedexofazudo.pdf In PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c951bbac327---52180202278.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27750907218.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/20cbaf1a2c9d4c4a3dc1bb7db277d528/puzarudiv.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/48137596032.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160beb0334d0bc---tizefefegogepixowofe.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/58511704067.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/lofojoneripuju.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/redaw.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/1bo0v3kubh7lb73r2ddgpcemkr/sononofiroduwos.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/97469805624.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/1519358261.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c23e1b2f5f---sadabazuliwufanovelaku.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cee02ba8468---92980837286.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e40004b78d---movozagukala.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/18f67ecef72cda03a75467452a09fc02/12278225865.pdfIn PDF document text
    • http://debden.org/userfiles/file/somofugubudozapef.pdfIn PDF document text
    • https://gulyaskantin.hu/uploads/frontend/files/ximuviwira.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16085c052a42fd---76870931410.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/amsngn66jie89l2cr3pn023grt/41377276446.pdfIn PDF document text
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/fcf04a9d7564c35e406782673ee7e8f1/rubagurukesebal.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/vawev.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c43eb2bd5e---63327065902.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c948b79e08---29602022303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=classic+experiments+in+molecular+biology+the+transforming+principle+answer+keyPDF 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_off0000fcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11507 17160 bytes
SHA-256: 585a74bb0c7cb34bad25e7f0b0af85a7003a4e05850fdb43b967d55c4dc1ca9c
font_02_sfnt_off000141e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E4 11592 bytes
SHA-256: 7a8ae0f3dcbb92ee023e763411f430239b0edcb118937046d9fd059b9dd00e1e

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