Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5bfd9243b62c27…

MALICIOUS

PDF

90.1 KB Created: 2021-09-22 12:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bd40db19d95cc196cba3ed62d7f63145 SHA-1: 2a6a30a28d85b36d9d089cf27df36f10e7f74579 SHA-256: ae5bfd9243b62c2765301d7ab075348f97c0f8541d6f1b2c3934217760faa67f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers confirm its malicious nature, specifically flagging it as a phishing trojan. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://aquamedia.cn/ckfinder/userfiles/files/26223536793.pdf In PDF document text
    • https://salvatoredivilio.it/userfiles/file/83440170104.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/gogubiketolezanij.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/zadolopulezat.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd205b6ec8---24135861817.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/lixowavejerixaze.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/suporobematuzozejex.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/59871657032.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/46294407930.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/pufov.pdfIn PDF document text
    • http://npas.ru/pic/file/wozogugijat.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/febenokizapexogevigejudi.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/28995317631.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/5051916894.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/zagowukiwumedagepatifut.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/9426657105.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/pawusifaxukukexisufapabed.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/95512396245.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/29795629389.pdfIn PDF document text
    • https://qnzar.com/files/78366341606.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/babovozafigililowego.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/60399093232.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161327fc57e942---94736705233.pdfIn PDF document text
    • http://imotrading.com/images/userfiles/32433279779.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613cff6055ab2---53663144971.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/tidixizowezofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=the+power+of+positive+thinking+chapter+1+summaryPDF 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_off0000f4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D0 11352 bytes
SHA-256: eaedb5846b13892f0135c02b0b992a854ae528ed94aa1d95c197f44498831f47
font_01_sfnt_off00010f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AE 19020 bytes
SHA-256: 995c24f612a8860bbf480696dab5c725aa16f6943f185fe7e0273f46d2c1060c

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