Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eb74c7405c94fde…

MALICIOUS

PDF

77.1 KB Created: 2021-09-04 11:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 255fe4d9bc3e5470822537ae3cddfb16 SHA-1: fd53696d17dbe85752a7dcc69444709b7e5c167b SHA-256: 0eb74c7405c94fded8ea4e199128674a58ebd5169985a9b7858a7ef8d83f2ac4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites used for file hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure suggests it's designed to be a link farm, leveraging disposable hosting and UTM parameters to obscure its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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=atlas+of+parasitology+pdf PDF link annotation
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9c7a32bee---kalizixutibadopej.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/54847327484.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/9e84e9fbf62ff480ef8a0d3ee4a42da2/mifofezosovasafogin.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/41467407704.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/razokeji.pdfIn PDF document text
    • http://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/57483204490.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/37819309553.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/39d1296ed0ece45499fc4b8964b7453d/13097199154.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161142c5b56db3---fazosiwazo.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/lotagaxodewukegesomep.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/92744256013.pdfIn PDF document text
    • http://skncn.com/u/files/96009815263.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/wobapesa.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8508c533c1---48058521630.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb75f7b320d---gixutaleledumileko.pdfIn PDF document text
    • https://faceless.me/userfiles/files/94532040239.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608053035e344---22933445170.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/13972892181.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/m387ifgqjl8s5fdkgefq88ad0t/viwozefug.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/4r1l2gli6qboodqqc6hdgn2b5s/37668669369.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/4cd74d78aae2f4c4137e080c59b6c9d7/fotalovilewonijetus.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c04a08f2c8c---batuziludorexi.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/finenonitanegotu.pdfIn PDF document text
    • https://aedwea.com/upload/foto/31247176147.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_off0000ca6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27E 17024 bytes
SHA-256: 3fb547944836cdd94335b6ae5fb0dda8d89958aff6312105b108edfcce08dd2d
font_02_sfnt_off00010f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F11 10532 bytes
SHA-256: ca43ed2402a11941166f2ef163d4a62222c0984e08adfc456dc362ee40d1b58f

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