Malicious PDF — malware analysis report

Static analysis result for SHA-256 eba19ebbd8622e87…

MALICIOUS

PDF

132.1 KB Created: 2021-07-01 16:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 55c071c6550285cea7a25c078405f450 SHA-1: c4c86dffa05fb9fb6a1477f01b04d498f8fc71ac SHA-256: eba19ebbd8622e8756220e0bc25fb93d75e966a2d0cec9bc87b7e995bb31d10b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, pointing to compromised WordPress sites. These links likely serve as lures to phishing pages or further malware downloads, consistent with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://laborke.ru/uplcv?utm_term=patois+meaning+in+english PDF link annotation
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/35vnb82guqb36fauc5ej7qh6sf/zofobetukata.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b6f78561a6355a5d69460215e8eb8f44/22587262286.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/68789562829.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/i79ra7teg3mdpp0b4lip9a2dvc/zisudijifokivitu.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/a9df1bd6db7c670624bc22ff81771db8/mabuwesaxolanoxu.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1609b588a18edd---95749502802.pdfIn PDF document text
    • http://lblussana.it/images/file/suwazoveroxupoxafakagak.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9f532f477---suginivolavide.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd59fc4c80---raxifefopafofinuruxawon.pdfIn PDF document text
    • http://mqskin.com/luutru/files/4668037733.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/16ec0a2ea6b21dbe53ddbc5560050be5/dowemexobamezubovamuruwa.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160878ae43c0b8---remabusejosevupi.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/30556949769.pdfIn PDF document text
    • http://jarosi.hu/files/file/64581867274.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/645be30a2c853b50f7774047fe09fc0c/viruwuliwotimajanam.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16072d4c17544c---fawokukuvefigobaxuma.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/8db1e5d81c96f9a4f8270c1e3a6ec64c/rolojuminuniriwawa.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dab032ca25---49500995000.pdfIn PDF document text
    • http://congtyvima.com/images/Download/84054659016.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077fdcfc0618---52023755002.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a5cd301d9---10867354405.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/2st4cotppjle2jotp0ssbbjsu0/woreko.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/62944531122.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be8a0f21133---riduboguputetosinu.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_off0001a310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A310 17932 bytes
SHA-256: 58dd4548b80cc9f4dcaf4d5d489b58d2301fbc0046307ae8326a3fc1089094fd
font_01_sfnt_off0001d1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D1FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ea16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA16 10456 bytes
SHA-256: 0faf8f8a77ee48e0385b095de53683e3922f6e1d27ebdcee7d35d85933a83489

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