Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab2794c10e4d390…

MALICIOUS

PDF

84.3 KB Created: 2021-09-05 08:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ec049cf236dccb41b211aee969560a7d SHA-1: 59476e65b93285379295c341b27f991d4ed4f5bb SHA-256: aab2794c10e4d3902d3c78751c49b4f461425fedda514433f337c7e463524f59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure the final destination. The presence of external URI heuristics and the overall structure suggest an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://crysiq.ru/uplcv?utm_term=english+to+urdu+sentence+book+pdf PDF link annotation
    • http://dhf-china.com/d/files/36285349645.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/17714162359.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/ririvanemavarev.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/latatolamajusolelag.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b75a6f524cb---36453232936.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/garilid.pdfIn PDF document text
    • http://monroehighbeachreunion.com/clients/8/88/88bd109b8fc96949fe6caf7698e88fda/File/40839115399.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/nonuja.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/peboridivix.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/wokol.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/46907359773.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/29pdtru0tvskiheetbl1v5keq2/22758554881.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/05/13/file/20210513_131835_113.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/kgvotul4c61bibhg198e9stsf5/91412948484.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/b93c09444c582ae9f115ca23f5d71034/33445070517.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fdfc717c862---nigerolovobisabiso.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607d72852339e---51065790930.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707dd86705f---bafafanisademotutikesemos.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/83ff60a1ed844ed94825a67e9ccfde18/gibibukisunesolipimilu.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba814149e32---60712000088.pdfIn PDF document text
    • https://nistd.in/userfiles/file/45328954455.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cd35cd45fe---dukibuwudi.pdfIn PDF document text
    • https://sanidom.pl/img/file/vakutulu.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/82779327639.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/94182259109.pdfIn PDF document text
    • https://phuquiland.com/upload/files/64872397933.pdfIn PDF document text
    • http://deauville.ru/files/file/63889610961.pdfIn PDF document text
    • 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_off0000e307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE307 17940 bytes
SHA-256: a19fb0caffbf820ca5e8b81ce3d45052e527b1ca8ebcfefdc82c2ef53b5d9991
font_01_sfnt_off000111ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EF 11052 bytes
SHA-256: 8db150479c8c15cc525232d7595f5f37958f605bdd2a4a2c2cc323aeb83a04f2
font_02_sfnt_off00012b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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