Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ee8b04728e5023…

MALICIOUS

PDF

74.9 KB Created: 2021-10-08 15:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ffe4be27b0ff01e575b8188a768dd23e SHA-1: 8c36591e8672237a5918be4238f42f7271e59c9c SHA-256: a4ee8b04728e5023f4c8f573221bff4d329d9614f559c040051503858c63175e
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 disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://foto-preiss.at/upload_files/files/96781541754.pdf In PDF document text
    • http://live-net.it/file/59382208708.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/soniravar.pdfIn PDF document text
    • http://artcvajk.friendship-match.com/upload/files/lisito.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/86279678075.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156073967920---19736880506.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f476c41eb6---40645292692.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/65760358140.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/wekusekoxatoderisifojow.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/tinoxulevis.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/91276310174.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/lozipolelusezojijexuzidup.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/vaxomunigelunasewaron.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614cc7c06f69a---foniteb.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202110030108026941.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/sisajev.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/85740150050.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b07489471f---69683791334.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/25801912496.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021091711225073499.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210909_120352_183.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+breed+a+deedge+on+my+singing+monstersPDF 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_off0000bf19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF19 17764 bytes
SHA-256: f1d88dc2daac9a6366280769dddbe1bd4deec95615984131152a716417522d21
font_01_sfnt_off0000ecfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10513 10876 bytes
SHA-256: d28e257b6ec1fa00a58b3fdd1f645238c1b4e2fe8be4cfe1603cb8cee7e63e77