Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aa4a7367c14f4f0…

MALICIOUS

PDF

79.7 KB Created: 2021-09-17 03:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f3f879447fa0f967413e4014a55ef2b SHA-1: 4ad5813d77527c4cda8acbc0742b17556cd72ec5 SHA-256: 2aa4a7367c14f4f08195f8945aabca7d18f75a873d97c5d7fb5bdac4ef45474d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms indicates an attempt to lure users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://brawlcall.jordanadams.com/ckfinder/userfiles/files/93041459059.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613383b35b4b9---razabanivemetojanamoba.pdf
    • http://hkacca.com/userfiles/sereninupiseju.pdf
    • http://kingkady.com/uploadfile/files/funezip.pdf
    • http://bdpq.hungminhits.com/files/uploaded/files/88050839089.pdf
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/23840162644.pdf
    • http://gachmenminhchien.com/media/ftp/file/biveravuwivolibe.pdf
    • https://scalping.ir/data/files/file/72820624986.pdf
    • http://krevue.cz/UserFiles/File/fojoxejadaboxe.pdf
    • http://kqcme.yiaiwang.com.cn/upload/files/zedan.pdf
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/tuzefugavifekisobul.pdf
    • https://lacausedeslivres.com/userfiles/file/25851911499.pdf
    • https://eghamatyab.com/basefile/bainbookcom/files/mivoxosafita.pdf
    • http://architettoannalisatinelli.it/userfiles/files/pugafuxewugobabisur.pdf
    • http://kompletucetnictvi.cz/files/file/91168600439.pdf
    • https://toptenstudy.com/upload/files/BodyFile__6132923CE055E.pdf
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/pasefajimosad.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/b550663cf802e9ef006d800f4b1705fe/34304240431.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cbd9a57b2---93238437325.pdf
    • https://noithathoaphat11.com/upload/files/koruzod.pdf
    • http://bluekeydigital.com/images/pic/file/15059465969.pdf
    • http://purepoem.com/resource/docContentImg/file/2021-09-09/4d0316f258ef1d51b6af0dd7430e91a2.pdf
    • http://metabolit-plus.ru/files/file/waxebux.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=harry+potter+and+the+goblet+of+fire+book+pdf+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d23b.bin
528c729062537381bf66dbaf5b82596a8001edc2e5d9333b7e8190b506f11084
pdf-font-stream PDF embedded font (sfnt) at offset 0xD23B 10944 bytes
font_01_sfnt_off0000eb09.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB09 16792 bytes
font_02_sfnt_off0001031b.bin
6a2b417fba1e377cc9ca2dd8325d3ce43db7d67d222daa0b50c7fa20802222b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1031B 17716 bytes