Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2678ec60af2f489…

MALICIOUS

PDF

73.8 KB Created: 2021-09-18 09:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bef7dfbce31190fb54fbd6638b4650ed SHA-1: 889e53adf2c6f7d18c01507936c0c5c5c2b3af7c SHA-256: f2678ec60af2f489dfc33a4ebf7fb975d63c4b19c08d879ec785e22ce118669b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. Several heuristics indicate the presence of link farms pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious files or host phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://safeabortionnepal.com/userfiles/file/zevujoja.pdf In PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/54015232043.pdfIn PDF document text
    • https://airshow-bg.com/file/linurowejolutovijiginofo.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/82458658485.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/dufudapademaminopi.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/7764697548.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16141bb0197d53---4581955161.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/43763198681.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/fuzejafoladigo.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/zatufulogumoxizar.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161384c09cb2fb---1586095747.pdfIn PDF document text
    • https://geloracinta.com/contents/files/raxiwesubajamepo.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/45990720223.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210914101554.pdfIn PDF document text
    • https://norservis.com/files/files/80951104463.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/61465145963.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/gosabasonumumo.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/porelor.pdfIn PDF document text
    • https://10fci.org/userfiles/file/47794918280.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/edd35240c676b112411b1ab28b0b19fb/55128165001.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/mubefezuzotudeg.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/46975834430.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/dotifuvo.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/bozulegojekina.pdfIn PDF document text
    • http://viettincapital.vn/upload/files/4733295402.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210904061553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=bingo+blitz+free+credits+2020PDF 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_off0000bd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58C 16432 bytes
SHA-256: 5df800039c2bbea59b065266be4944ae2a8c04ab40c00c106b70b10e0e8e5e32
font_02_sfnt_off0000ffd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD5 10984 bytes
SHA-256: 4d7cc32e8e0d030e65efafd6ff7cc858edb5e79b8f7d81db44de094149e999a9