Malicious PDF — malware analysis report

Static analysis result for SHA-256 a244a5a6027d7243…

MALICIOUS

PDF

92.2 KB Created: 2021-07-13 15:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 89ea7aaab63f385cd6d87632190d79ea SHA-1: 0980df91036400dcab959fad3a164ade843b4060 SHA-256: a244a5a6027d72438e7d4c6bd0797c97d792c3e11ac0f06a0634a87f0e139eeb
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute phishing content or malware. The presence of these links and the overall structure strongly suggest this PDF is part of a phishing campaign or a downloader for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://ourlady-schools2.com/userfiles/files/41645341145.pdf In PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607375953c1e8---70769811354.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/25596590917.pdfIn PDF document text
    • https://kund-in.com/userfiles/file/74243796791.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/nitujapotojibafuwexi.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/1c1e20149aa2bb348b2f627ccefcb1c1/lizewomirojogokobikili.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/06/202106281124447300.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/mapodarovulemeruzapifa.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/97599280966.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/jo40p6iqdpsv7627qhd1vm6r75/futebe.pdfIn PDF document text
    • http://msiutilities.biz/documents/71222550631.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/7146026008.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/dd5ac5edb147038113aa371f5b015097/66085379536.pdfIn PDF document text
    • http://tort-art.ru/userfiles/file/82037830361.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/17643385727.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/11447099756.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083842b82bc8.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/df44b89aa157848f1998eb3b67eac384/66006592668.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/48182198979.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/vk9c3h4s75rsinrtnr900fle34/82944138724.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/28909251963.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/xexeripogolojetorodel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=tame+meaning+in+tamilPDF 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_off000101c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D6 19340 bytes
SHA-256: 77c7a3db4d8abaec60f28fb97ff86ee0d4150e1b4fb6534f0505a4ac59f008b1
font_02_sfnt_off00014b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B32 10024 bytes
SHA-256: 6c0fa16c1ffeb6c641ab4ca4439718fad3de1482d8e80dd9efa613fd67503a91

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