Malicious PDF — malware analysis report

Static analysis result for SHA-256 7775f6d2f3bf5136…

MALICIOUS

PDF

113.0 KB Created: 2021-08-13 02:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cbceeb2ec2301c66558d47265a1a3a9b SHA-1: 68b8cbfa48c681cd881e5213be876073aa218df7 SHA-256: 7775f6d2f3bf513618d5b5f6ee2e4616e2eefeba6e00aae161605f4833e6f7ec
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised or disposable domains. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests an attempt to distribute malicious content or conduct phishing operations through these linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9852

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://chothuethietbi.info/img/files/bubepixowupulid.pdf In PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/9c53e850fa63d7de8b0ea99eb998cdfc/30096136822.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/mapitazebob.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/av6rsg2ak52jr3k1n2848apdq6/mamabovizisipa.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5890e259c---xudobos.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/1250510393.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/71724910852.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/badf2ed58072a42ac444d4c5ebba7f57/80606977960.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/85268973882.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/mojixefuwurexa.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16087aeff6c597---5967349336.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/51583309041.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f8e53ad4c---fagukexaxoxezinebeni.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/cd95d94a97c0eab684790be371620725/44232285150.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/vepironusegizip.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a79a1399a2---wedebomedebomefufevilaf.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/66192686703.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/9ad09bba17aa5c8793bfba33ff79ec38/50557646420.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6b432e708---85391335049.pdfIn PDF document text
    • http://uctodane.cz/UserFiles/File/34086979460.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723e9f9bded---wivorajusi.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be2292e8c02---kojixurig.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/jamerox.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160855bf46979e---27845483756.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/cc2npu6h5399sfmtkjg8g7ck0j/dalivuwawijipibojijidare.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/cab987b2b3ca24b8069a19285e79debd/kinusorijisi.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097435b61a42---34437838448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=reading+plus+answers+level+i+stop+the+oil+spillsPDF 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_off0001514a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1514A 18644 bytes
SHA-256: 0940969ceeb072c65afe85b319dcb42a1e917e1d20545ca5e08a9a1d2da3fc28
font_01_sfnt_off000182f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B0D 10968 bytes
SHA-256: c97457a088ad7bbd576516faa5a813734d1d46127f588fc171feef9c377adf58

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