Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4fd1fb0a2aa409c…

MALICIOUS

PDF

71.7 KB Created: 2021-09-28 20:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 03110b39eae771f8b4c3c1cbc8672668 SHA-1: 972d3891ac0a9d5ee3c76789f16c540a981446da SHA-256: e4fd1fb0a2aa409caf4e0d035b3d5be965406288b4dfede5a27ee2aef190af8c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://budapestpainter.hu/ckfinder/userfiles/files/73791629548.pdf In PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613027201b1bb---wemipafilikofadepeso.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/pebob.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///balutesiranimozisologemod.pdfIn PDF document text
    • https://tierlistei.ch/downloads/xesavagove.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210912200615.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/nopotoxu.pdfIn PDF document text
    • http://ilkemymm.com/image/files/davezusalekinelar.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/suvuxog.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/numozufoferar.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/49089135727.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306dfa8e9b4---wojikedapilexonojibota.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/3397846974.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///71337599709.pdfIn PDF document text
    • http://levotst.com/uploads/files/felowuliporivirefula.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/mijimike.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/mudejubibatunirebuzeguguz.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16148f8b5231bb---sewasuxulurigafipu.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/97082969376.pdfIn PDF document text
    • http://jsdarvin.com/files/lenewupepuvitebafuvufami.pdfIn PDF document text
    • http://techbis.pl/files/file/93271649595.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/92837164345.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/89064457204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=airplay+android+tv+apkPDF 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_off0000b1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B7 18840 bytes
SHA-256: cce3cbe76114a94fdeeda8623f2fdff804da1a48b4a48f2f21e15696db58e49d
font_02_sfnt_off0000fa00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA00 10336 bytes
SHA-256: 23f0d48a59fea144f382b97e02a906903ae08ff6cea5d1d11adc89f6bc085aa1