Malicious PDF — malware analysis report

Static analysis result for SHA-256 75375cd19b4dfdef…

MALICIOUS

PDF

85.5 KB Created: 2021-09-18 18:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5c5b7e8e0ee5b636ecf9112400741387 SHA-1: 2ef271bc13b5a9472ff146b6c09d6a273d26f47c SHA-256: 75375cd19b4dfdefc19f11de7c4acb00b6ca69a760883c10fcc2e5069842734c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS upload storage or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kamionosnyelvlecke.hu/userfiles/file/zenav.pdf In PDF document text
    • http://aucoindeshalles.com/menu/file/sajufolokidira.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/99317362195.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/41743107947.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/zesugasapezaguwaguzalori.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/sofoxe.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210909_034727.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/katujisevetogiworu.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/bonibagekojotubaseluwoned.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/xasokapevojanirojexep.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/todugofodutagobozoko.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135e40c6a1b8---dunudejonejulimajelojuba.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/f1df6e4b89b6dd4e6f1a989718f000e1/gagosikaxetun.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/lafazejigejobotufibefi.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/97231179487.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/wugetu.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/zosopujubogepi.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/xinoxopu.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/96805689509.pdfIn PDF document text
    • http://dmkert.hu/files/file/44101603034.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1612fe25cec1e2---77918131923.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/m24oc0tuvbcjtbkqlma9351pbi/72598465255.pdfIn PDF document text
    • https://upaspor.com/resimler/files/73948470009.pdfIn PDF document text
    • https://upaspor.com/resimler/files/dikulevejefiwifo.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/fakidumubediworo.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/kilawofufijidavixuwujas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=english+novels+for+beginners+pdf+free+downloadPDF 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_off0000e6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF9 10952 bytes
SHA-256: 883fbe6aad63d5d0dac77e9090ebf36bfbb353ed85549607b0ac362a6cb39c43
font_02_sfnt_off000117de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DE 18484 bytes
SHA-256: 5270d732737eedaf331389f2b78cbe20a84ec7abbc5592be151321904434e0eb