Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27e6fc78a6be4a3…

MALICIOUS

PDF

69.9 KB Created: 2021-09-28 11:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9d281ac0ebc9753b9d7edfc142d5899a SHA-1: 6eb57ade6285fa5dbc4fe1c93ab84ea8f7b68a78 SHA-256: d27e6fc78a6be4a3e6723e5e8335963c6d11c5b34cb66551b7d90e129c4bd650
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm hosted on compromised CMS uploads, suggesting an attempt to distribute further malicious content. While no scripts were explicitly extracted, the nature of the links and the detection suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148477319a84---93931145578.pdf In PDF document text
    • http://artecgroupservices.com/imagenes/file/fisarejojojozaru.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/jubaboxataposikepigezifug.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/jowobabixovexenasudiboxu.pdfIn PDF document text
    • http://asja.ua/userfiles/file/13903225031.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/lukedufezopig.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/9fd3bbecb76fa6f7b0384795d6c883f7/67641565281.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/ljv2p8bkvluldgojjnjqt58b6p/59350385917.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/76166577190.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/rojolebaxidozokarumab.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/65851613724.pdfIn PDF document text
    • https://thehouseproduction.net/file/likatopas.pdfIn PDF document text
    • http://www.ezmoving.com/file/50437737178.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/desem.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/71349843241.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/xijudulabavakasujunugo.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/3937316027.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/1488356267.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/fijevadogegume.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/kibodevawevifaladepusisa.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/tamuvipomopanoneva.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/88554940879.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vurizakijelufujixetob.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/13118332494.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/bubikeboniravoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=free+idm+for+androidPDF 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_off0000b3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E8 10180 bytes
SHA-256: 343d18dcfc146154a5f4b6f98eab35d694ff883462e8406d419b0ce9d366d3bf
font_01_sfnt_off0000ca9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AC 15480 bytes
SHA-256: 975ac0c3b5c8320fc4f0153332dd2cbad16a480ca5805b406019c18c3b1e85d0