Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d38e62a35d79a00…

MALICIOUS

PDF

68.6 KB Created: 2021-09-25 05:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 04dfd4000bdf09bc0daba0776d418df1 SHA-1: f35a6ce790e24c27d75ed12e070c1242ad25c812 SHA-256: 0d38e62a35d79a00c8a17bb1cf60456bd7836708b4a92738fd3a09fb1ce88130
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to disposable or compromised hosting, likely to distribute further payloads or phish users. The presence of multiple external URIs and a link farm structure strongly suggests a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://graciaindoutama.com/kingkong/userfiles/files/zobujuwot.pdf In PDF document text
    • http://effektfilm.de/files/file/lepibuleraladematafibuxel.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/b626c33abd060c14ba6d5d4ec36ec4e3/87832098525.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1b3518c18---40952456751.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/11588756557.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/nulobif.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202191811050662.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/rimobawunewonizavuj.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/wogidibirub.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/35274997549.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/e14eb3d098e5cf2228ae6bdaa5501d66/29246363549.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/70129422991.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/18317823674.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/zinevuxigodifes.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/94774140840.pdfIn PDF document text
    • http://charivne.info/images/file/fivijarukewexovixo.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/ltdtn11nqj6vepudcncle7ul5f/8077373292.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/gozixavebojugekosu.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/26308403925.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/49209064207.pdfIn PDF document text
    • http://telecycling.org/files/file/60516501368.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/mufuxuxaxalolibevir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=smartphone+not+connecting+to+wifiPDF 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_off0000ae2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE2F 15108 bytes
SHA-256: 0198d4a884d4f503d1b53591908a5ff3033ddf3191610e0d32621cd793bcf130
font_01_sfnt_off0000d3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FC 10872 bytes
SHA-256: b845bfc14169f21065d88df35986b5e2e9b73c62aeef4b21a1a66d376def28a9
font_02_sfnt_off0000ed05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1