Malicious PDF — malware analysis report

Static analysis result for SHA-256 9edd32f804a81ebd…

MALICIOUS

PDF

88.9 KB Created: 2021-09-19 21:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4391dc37b10d5a74802d05c3dfb112f1 SHA-1: 55265f20b09bbdc9ca5319fcb0d04b23eeb39577 SHA-256: 9edd32f804a81ebdcea92e2dbf12c862047268b7756b591a691b091cf7af6620
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous embedded URLs that likely lead to phishing sites or further malware. The presence of these links and the overall structure suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.electricman.in/demo/frontend/web/uploads/files/nerufidelixoxidikebugofu.pdf In PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/95928237856.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/dugovekapobedofapef.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/jatojonurugomavogoxu.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa4abed8a4---21829692515.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/sinudijan.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/79383508260.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/6ef76f3716ce367b2b6dce9a040535ba/78405466483.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/27132020486.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/23283830953.pdfIn PDF document text
    • http://diadiemvui.com/upload/files/51941204535.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/33292356375.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/21574028163.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/33288980610.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/musibibebipoguxixedes.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/vudusino.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/36006240706.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/goxezamafepikobuxolokop.pdfIn PDF document text
    • https://interangkorcondominium.com/userfiles/file/53104185244.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381fbd97b53---gimoduxamekozu.pdfIn PDF document text
    • http://yieldpharm.com/upload/files/nosuxapedemavijexanip.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/nakujuzivis.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/23570108250.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/lipojogonalali.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/sujizowogezivulopevi.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614345fbb169f---zedime.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210907_3B15D8F8CEA500DF.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=app+android+para+ver+sport+tvPDF link annotation
    • 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_off0000f455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF455 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C67 19072 bytes
SHA-256: 876571f524e617759fcabbfe1f1335c2b8004b6c14caf934a0bceb69426c456b
font_02_sfnt_off00013de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE3 10388 bytes
SHA-256: 72c0e0e5462fa395215de5d1c2bcbd16f8b4a4a5a3ee26e6fe9120efc0ca975e