Malicious PDF — malware analysis report

Static analysis result for SHA-256 f71e3ba19d022d17…

MALICIOUS

PDF

69.0 KB Created: 2021-06-25 10:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: bb06044e78c23ecea0d6ce7337c78c7d SHA-1: 18c12d32cf918ec52e3afd8a5937bc8a61b1e98f SHA-256: f71e3ba19d022d17b361da1975db4f6338fcbec73533dcfea0e15ba5c777d45d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, hosting numerous PDFs on compromised CMS upload directories. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to distribute phishing or malware content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792dbfecec8---85954921624.pdf In PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/9ffe1bb78317a7057e1932f80e42e2e8/17584743570.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/81405573700.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/dewalijafebiz.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/ee2c4471c55fc7175e10f6275ff7a530/29406451513.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210604_0F77C63E4E14865A.pdfIn PDF document text
    • https://abeess.com/userfiles/file/77762399859.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/kijimox.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/97998637671.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/12779c9149e0776ade1b6ce24d641fe6/xivexivetinelemel.pdfIn PDF document text
    • https://namlongadc.vn/uploads/news/files/zofitavusegeneleforeli.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/5d0a3ce9eaa57252374242ec0a99e44a/wegefikojalapokajeku.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/17h4uhdm9d79rfd0j0dibl98e1/83297471071.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/mukuputozixabima.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893095c4d1e---14862903888.pdfIn PDF document text
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/42b45c00754c918cfa846a7e1e619565/bulojunurimitoxiw.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/43da41dbe19143b492c1fb1284219ef3/kakawebedikabevifa.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608171fe6f20b---86689327045.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/6vibd6nuj11cpv8v5nntpkqiju/mirovimuzi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=free+us+tv+streaming+sitesPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11C 4988 bytes
SHA-256: 96518134c2c248c78af81e4bdfaff0e996d8c344f4d40e7978e75f390eda04ae
font_01_sfnt_off0000e209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE209 10908 bytes
SHA-256: 062332c6c043da3cc54b738dbc75c26eedb9d397544184826cb05bd824cc91fc