Malicious PDF — malware analysis report

Static analysis result for SHA-256 d809e270ff2df18c…

MALICIOUS

PDF

85.6 KB Created: 2021-09-19 13:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5265ce11cab88726d242e8866ef19c36 SHA-1: 58f94568ed2d089f40e4c37a04bfbb0a0f6339b0 SHA-256: d809e270ff2df18c0af2850d98cfa1a5398116491f73179850395e65cc52f5a1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links pointing to external resources, several of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to download a second-stage payload. The presence of numerous PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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 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 https://rafautama.com/uploads/file/dakoxopixozum.pdf In PDF document text
    • http://kammed.com/userfiles/file/jeluwosebukerivif.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/35035104497.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/xukemenofogob.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/73456630309.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/kikidolisutu.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/kunasavimoporanefadadami.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/97533447408.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ba81cf554---nepudukarusowefat.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/64278221171.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161325cb40c2de---48641605033.pdfIn PDF document text
    • https://edex.co/userfiles/files/xikomaridemolixedamarome.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/firato.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133be6747844---18542100651.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/jefitadobelapazujav.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/42132609784.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/viresomefebogod.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/pudutefujelebefe.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/dl6iug1vi5bb90c802s4q3q2p7/mabuletebaseditexujugoj.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/63347870608.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/tatujazi.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/kesidivonusezufevifexuxo.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/aaeb732deab36fdc725c7b792b34277b/36334101301.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140eb4adee42---rabexadat.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210901_110523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=colmi+p8+price+in+bdPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC276 10624 bytes
SHA-256: 4f29d99b1a36f37dceba8f94db926df1ce245a54140b20f0c177b6644f8aaa9c
font_01_sfnt_off0000da65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA65 16180 bytes
SHA-256: c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f
font_02_sfnt_off0000f00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10820 21408 bytes
SHA-256: de2a05487b70c04e6a9b10f87ce58b050026a05ac28bf597f10e04ef9cd0202c
font_04_sfnt_off00013fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE2 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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