Malicious PDF — malware analysis report

Static analysis result for SHA-256 d114825d25103169…

MALICIOUS

PDF

83.9 KB Created: 2021-09-05 04:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 777ca1c8c4cadcec327d275b50c49baf SHA-1: 08843839b006bc5abe3b5554f681a3f6f3f8b41a SHA-256: d114825d251031691934f9148bcc6c77effab90760219290ee1bb0d4c3d3c20a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, suggesting it's not intended for human consumption but rather to host these malicious 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://studiotecnicoprato.eu/userfiles/files/dawitididebemup.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608914ec3514e---repinofatorevupami.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/nasumaditig.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/73713814381.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/77643333364.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be9d0247a32---relulajukiret.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/64769906178.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/44422882049.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/limolasatal.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/wokufuwalaxegudesopo.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202108310523032801.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210621_958A57D1EA770364.pdfIn PDF document text
    • http://uniquestatues.com/clients/9/91/91c6e204ee4529d3b478b0717040545d/File/jizatibajexobefipixa.pdfIn PDF document text
    • http://leguido.net/files/taxikefesazixugutozewu.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/36035394640.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/visikarefibomitojatix.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/vnjc3nmhqd8d3jfqh9ja9ufrh1/dutupolopisuzokitozeme.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202171384119174.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/53403543637.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/fariradimoki.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/81727247164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=pc+maintenance+%26+troubleshooting+questions+and+answers+pdfPDF 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_off0000e61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61A 17652 bytes
SHA-256: 8ebb1e923a4277f12c03c0806a0633c1ce80a093edccce2fb1786b0c916850d8
font_01_sfnt_off0001143c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143C 9960 bytes
SHA-256: 2bef116ec652156aa23c5a0173e70fdbbf912d69dda8449b5ebfebbf90510826
font_02_sfnt_off00012a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1