Malicious PDF — malware analysis report

Static analysis result for SHA-256 f419fbceb12d9f66…

MALICIOUS

PDF

82.8 KB Created: 2021-09-15 09:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9ab9dd90345ace2364573f682e9e1287 SHA-1: fefbc94a49dfc4e241fbf40751ed46317fdaf0c0 SHA-256: f419fbceb12d9f66c0f937ff6cbd0771e87bd678d66e4875a3534d8e7899f7c0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various URLs, including one that appears to be a download lure for 'watch anime offline apk'. The presence of multiple external URIs and the 'SE_DOWNLOAD_BUTTON' heuristic suggest an attempt to trick the user into downloading a secondary payload. No scripts were extracted, but the overall structure and URL targets point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • 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.
  • 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://coretry.ru/uplcv?utm_term=watch+anime+offline+apk PDF link annotation
    • http://mesterteto.hu/userfiles/file/27480119598.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/39706493237.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/83799270804.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/jifobepofu.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/59395542946.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16134f5f540470---12648453630.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/vinenifosedifojijako.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/dotas.pdfIn PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1630728035/files/vadumimiwumajavipo.pdfIn PDF document text
    • http://cudicio.it/images/file/62217602062.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/22962087980.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/moxiteziwuguj.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/bumaralufoku.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/zoromopujivod.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/8575561006.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/rudufiwiwuxigibileg.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/beripofomiwiradero.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef366632f7.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/faxuwopeje.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141749e8d311---60171771823.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/43262947633.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///7239008073.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE1 10564 bytes
SHA-256: fb416e8edd6cf708e8a5d30a91761d7915a7ffbdf67f30f5aef6c53249c1e56f
font_01_sfnt_off0000e2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADD 16192 bytes
SHA-256: 126aabc53b187bc4421529373f04e2f66a11804dfeaeb35cb650b132d56c1dbd
font_03_sfnt_off00011083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11083 17344 bytes
SHA-256: 3447ad2c609d9dd45f19010a4593557a3cb91a4c5681debb9dc2167e99eb6425

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