Malicious PDF — malware analysis report

Static analysis result for SHA-256 a27d2c2afa5784c3…

MALICIOUS

PDF

83.2 KB Created: 2021-08-21 21:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 562fb02e59f311561f765ae44a534979 SHA-1: af8515f84c3ea966718509387d6d5228c9ca1a0c SHA-256: a27d2c2afa5784c3b1d9159f5e9e735de1cdca8a11f9d6478acd983915650880
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure point towards an attempt to redirect users to malicious sites, likely as part of a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://laclonghotel.vn/upload/files/borupifidelunopifiwa.pdf In PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/0e93bf22e18e9c5692e12d62c1389104/35093506625.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/luzuwinonurapabururopago.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/71bb9f8690eee7f61062f361914c1a13/radelexigivanaxor.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vh01q85urusb4jpkcr145f4135/23084418822.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/vunedovetugijifobapigux.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/e3ed30b696a3a93b8effcd93bcd90591/46444140377.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/g05ol21vssi8ckkvp32gafbes0/lebuluzesotamoxanutovivix.pdfIn PDF document text
    • http://unityproductions.com/upload/files/fesiwaforev.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/nijofixuwupififidubuz.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/95111842212.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/94411552453.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/wazabufemag.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/2d6b09e26ad35e9e8cb341b40d2a32e0/14494165266.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/ninofunoruligovitog.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/dixukato.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/61a362dc412f869ee154afeff816590e/vimewufuv.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/nolegumotokolon.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/43916412654.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16092a98e3f336---sojuduzujis.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/51761019350.pdfIn PDF document text
    • http://alkimosgb.com/userfiles/files/54864251048.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/nakuvotusebepuwodalose.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/e880008c11bc84d193048cad87d6b849/14447440175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=broadchurch+season+1+episode+8+youtubePDF 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_off0000df51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF51 11232 bytes
SHA-256: 3a310d8fb16c906ba2e6d27f5cd9ac0d0b1189d5e500a16b34fa2a7ee5d4b7c2
font_01_sfnt_off0000f973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF973 16680 bytes
SHA-256: 00459ab32f4d59ae5076cf50aa503e2bef0b6dba636fa5b6d3f3b16d8bfc46b6
font_02_sfnt_off000124e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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