Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e629013c429bb36…

MALICIOUS

PDF

90.5 KB Created: 2021-07-08 09:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc43113d611d605fc6c16d514067cf6c SHA-1: fa6aa3c18e1bc54ac0cf7d083f03b26e31eea063 SHA-256: 4e629013c429bb3645786838297b75d490d8caa275966ede5417f14bfa86f574
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/6455f9ca7bb3a86014bb93001f882cf6/48055194344.pdf
    • http://driver-jazda.pl/upload/file/ruzaw.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a30358bd4b1---38205783862.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb3c7e6639---sirusazamemebesonusafibap.pdf
    • http://baraanduliaptti.org/userfiles/file/34924397102.pdf
    • http://07-3739589.com/CKEdit/upload/files/mosuzovokimijiwe.pdf
    • https://cezartravel.hu/userfiles/file/vexuzulenevowovivimuz.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3f6b0170eef8e366856db184e0602c6b/zozopaxo.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c462d7059b---netuxidutelimumowowukisik.pdf
    • https://songod.vn/uploads/image/files/29138030346.pdf
    • https://marathonroller.com/userfiles/files/gorujarejomezezixirenolo.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea44a61c78---liwumawepunedulod.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/3569176b3ef7de064880d887114589d9/tewulaj.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e14a4583c---zovevudu.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/72835dc6ab9c29f7423c59b9b35ddc50/kopodoki.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892a6e2df61---54307457250.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9f1fe8b40---redaxesopexutuvaleb.pdf
    • http://eprdel.cz/userfiles/file/kifuxujusukafawuriworo.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46239f2926---64375283789.pdf
    • http://ibb-online.ru/f/file/nurewexegamubibe.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079adcf7eacc---rawemifetefutugetogaxarem.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607eabe41bbbe---50574720542.pdf
    • https://cnn-logistics.com/asset/files/tevose.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/917657f166987d352b6cad8d2cc72aae/kakibumob.pdf
    • http://intrinhgia.com/admin/webroot/upload/image/files/sujivexasimuxupelol.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/didegusajinuzenukofiri.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=timeline+of+religious+texts
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8cb.bin
aca2a8c8c2852f8c85f77a9dd3cad0e1113f75639a4b3bd58f5344e0be2a84e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CB 20252 bytes
font_01_sfnt_off00012ca5.bin
711113584bcadc31abb4cb891db68e8fafc4e4d08e4f0b20edf231e3600e7540
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA5 10560 bytes
font_02_sfnt_off000144bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x144BF 16792 bytes