Malicious PDF — malware analysis report

Static analysis result for SHA-256 50104b1ab52d3d4c…

MALICIOUS

PDF

70.8 KB Created: 2021-09-18 14:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35ef1fb29892d3dc0dacd622538bb78e SHA-1: 00d7233f41105b01136f6bf755e509f441f6f6ff SHA-256: 50104b1ab52d3d4c60ecbdbec63591b9768c4fa1073fca5cb823a8a525cce122
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, designed to lure users to malicious content. The presence of multiple links on compromised CMS uploads and disposable hosting suggests an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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 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://hsaltsj.com/uploads/files/60206787455.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417a9012f59---junixitomujazefasevinoz.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/81adfce9e1f68d8232bb83adedcc0249/foxikapijulijojowati.pdf
    • http://maximaviajes.com/FCKfiles/file/52566109597.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133793238d73---82405611864.pdf
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/5198457279.pdf
    • https://propertiproperty.com/Uploads/userfiles/files/xepadejozosonobugosibomij.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f05d990f93---mabijixogibesomivazaxuw.pdf
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/51781491071.pdf
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/zumef.pdf
    • http://parcroyale.hk/userfiles/55700141548.pdf
    • https://okazdedziecko.pl/_files/Media/file/77403846095.pdf
    • http://gestaocipa.com/public_html/Imagens/file/91399727072.pdf
    • http://jiangsutravel.kr/userfiles/files/20210906_040644.pdf
    • https://meganimal.pt/site/upload/file/talusakeluxoresawofifub.pdf
    • http://trieuduong.com/images/Download/46227520808.pdf
    • http://fantasymusic.it/userfiles/files/24563527028.pdf
    • http://nomorecpapmachine.com/userfiles/files/dadofuxiburelolutakosum.pdf
    • http://vietsaovang.com/uploads/userfiles/file/fexoturizoperulat.pdf
    • https://asesoriagade.com/app/webroot/files/files/fejemikepufani.pdf
    • http://www.polni.si/Images/files/33246211260.pdf
    • http://debten.net/UserFiles/File/kafik.pdf
    • https://nikoljski.com/ckfinder/userfiles/files/71005236426.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=wwe+2k+2020+game+download+for+android
    • 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_off0000b61d.bin
c51000bbaead164141196569e75487c52ef9262e9ec93d16b93173453f19b678
pdf-font-stream PDF embedded font (sfnt) at offset 0xB61D 10844 bytes
font_01_sfnt_off0000cef6.bin
7bb176410d17c1f3998cf6a94bab939877af305c7684882e9035ce0b72e3a27b
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF6 15276 bytes
font_02_sfnt_off0000f57a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF57A 16792 bytes