Malicious PDF — malware analysis report

Static analysis result for SHA-256 051307c490e9bcfe…

MALICIOUS

PDF

87.4 KB Created: 2021-09-03 13:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f1842be3cd6c59e4e1e5b5ab088d0ad5 SHA-1: e0c7c08552ec51dc7b88af9baffa560cfff9d796 SHA-256: 051307c490e9bcfe47222588cdd661e0477748fbf424404325c3e67a0ea9fd21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the sheer volume of suspicious links suggests a coordinated effort to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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://chcial.ru/uplcv?utm_term=manual+garmin+vivoactive+3+music+portugues PDF link annotation
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5951d2e9f---lelududemibekof.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/c8a6j71d6kel8q0g6fe6m4ku9l/xakifoxivuferu.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/10347735113.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ffe7c8387---wojusajujaxaloxeguxe.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/10189853181.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6c76fa293084df7512e4e9d7e919dbe5/61011339892.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/rorojatuwunile.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/30543260612.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/70630079521.pdfIn PDF document text
    • http://lowchens.org/userfiles/file/31393371122.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608912a38e0d2---javunipalarirake.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d6338e768---mekotigebixurowisewugoje.pdfIn PDF document text
    • http://yejida.com/userfiles/file/baripukuf.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/7f4329da33b6057f67dd6b341e9d607e/jinadagoleladumoxek.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/98834640627.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad149d7826---27009001092.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/56772081013.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c6bdbee8fb35f557829b7789a6c92331/98589227960.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/wisesemimife.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/7a7d44b13f83133d0e29a2fd74500abb/wimemapujijujozabeluxaf.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/zigilekafipulu.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b93622526ed---gisofigururo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD137 16180 bytes
SHA-256: c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f
font_01_sfnt_off0000e6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF2 20184 bytes
SHA-256: 8d6b7a59e77c22484eef4ddd07d63e6605e324c63902a5807ada471b7836ba6c
font_03_sfnt_off0001336a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336A 11048 bytes
SHA-256: c4518e8dbf4b1fd67ea0ce4d03a36550098e01363e5c2c8df2aa604b92a1f5cf

Open this report in the interactive analyzer, or submit your own file for analysis.