Malicious PDF — malware analysis report

Static analysis result for SHA-256 af6a521566cb0e0a…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 21:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 624845ca0cc472f3bd8ee968bad975f5 SHA-1: e14a3dab7f8aa25897f841860600459bbd4e5024 SHA-256: af6a521566cb0e0a5b0cbd118a410c3abfe1b065e9cc8d29a798b2aba2c9ebc3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, some of which are identified as compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • 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://turksebruiloften.nl/userfiles/file/55238514634.pdf In PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/gafitazigizepajewinela.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/zezanefidesenob.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ae209fb14---22036587798.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d330a6215e---vitovefot.pdfIn PDF document text
    • http://tano-cable.com/d/files/misiridovujojekunin.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/50096708490.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/53710201912.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/45281781204.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54272662167.pdfIn PDF document text
    • http://harlit.com/upfiles/file/veduzuliti.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/nakisimororegariw.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/41617889511.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/20935370075.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/43184461081.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-10/20210910220252404020.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/vodopevukixirixobogor.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/95974986677.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/gamixutakunugijopenitujes.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/cd3d4239a4c39d269f9ac3b81a8d2b7d/zefiresiguxo.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/16062608895.pdfIn PDF document text
    • https://fishuntpesca.it/file/gamizoberuronute.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/55197555478.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/radapunegavagusezoragi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=redmi+note+9+rebootPDF 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_off0000dd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD77 10384 bytes
SHA-256: ba973ce4fa46278f443111586bdcf782a39d04b3f2017dafb66ca4267ba2f285
font_01_sfnt_off0000f4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EC 18052 bytes
SHA-256: 45609e3d491ba67033cd6c7f825bd231aef37cafb92d2ea12c762bb10ef54005
font_02_sfnt_off000123a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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