Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ff14cc3ba1b5a3…

MALICIOUS

PDF

95.2 KB Created: 2021-07-31 08:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 12d7d91cf1de4442edc94f179e5829dc SHA-1: c93dcc151317bc8ed7076c3cf64d6f1ff033e2c2 SHA-256: 66ff14cc3ba1b5a332c3ec42052dad52b4f17bd7f57a653dde8591c915b94e1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or serve as downloaders for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://crewmak.ru/uplcv?utm_term=simple+origami+book+pdf PDF link annotation
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b209f86ddcb---vuvatunun.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce586db050---90137295522.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/b5ada3179af4b71428ee7d3a4581339d/fitavataripifi.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210514060048_689404889.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086c1032381e---dagajome.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/355318c00486d6a0875322871df4e620/pasenewoturug.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1294f8447a---vazijederuxosorepone.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/0ea8b85b00eb799f7aae6ed80242fddf/tisopakel.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94a70627f---vufaresu.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2dc74849c6---basoxu.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/5lgbs5s65tisaec6c1hegp67u6/defokuvuta.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/jurekekeminorudopomine.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/8cf88be5cafa1e08886f365bc6053c22/92001956949.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/vaxofirorezakazogefosif.pdfIn PDF document text
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/74137812745.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/a2174e1a157a721ce4a80aa1fffee981/galiwiwojumi.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb4196faa5---gelerofuzunudijujegapewe.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/82642643020.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/f73601cf876afad12eeefffaa6384348/nutulilowinafalisi.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/94887385937.pdfIn PDF document text
    • http://strandedtattoo.net/file/zigos.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/livaxovotifibon.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/jafefivobenoxipo.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/6787c390412b3f0f39c32528a897fd19/dorafanapoposugun.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/vekupivinosuxufol.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/lksnvm7dso159t7mrmjb2f2jq9/takopazejadema.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_off000110c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C9 16896 bytes
SHA-256: 7c00fc7b48eb42d417623f44a44cac6175cd53df6ea3c362480e08885e10ef01
font_01_sfnt_off00013c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15473 10780 bytes
SHA-256: 1cac57ecdc8b37b3c08b740a428f55db2423666728a152a4fc28f018d58823eb