Malicious PDF — malware analysis report

Static analysis result for SHA-256 54a374156449bf29…

MALICIOUS

PDF

89.9 KB Created: 2021-09-13 21:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec8a3514f084dd73e8896af199525193 SHA-1: e2bc2bd8327d2388e6a90a8160632b9001108f51 SHA-256: 54a374156449bf294fb85203c91e2baef2eb019383c3239eac6dd4e772838f82
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various external URLs, some hosted on compromised CMS platforms. The presence of a 'download button' lure further supports the attack pattern of enticing users to click on malicious links, likely to download further malware or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=anjaam+pathira+full+movie+download
    • http://bukharageorgia.com/sites/default/files/file/89120538029.pdf
    • http://rtm-plus.ru/ckfinder/userfiles/files/sibelowikovamabudomizabi.pdf
    • http://reguitti-engineering.it/userfiles/files/97258693379.pdf
    • https://indiantalentjunction.com/milan/media/67766254498.pdf
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17574351258.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa6bf09ffe---badogedubumademigulunix.pdf
    • https://ctcitsupport.com/media/files/nipebibepumorazu.pdf
    • https://atputasbazes.lv/images/userfiles/files/92630701542.pdf
    • http://bordahusfeldolgozo.hu/editor_up/tevilupesuresisijisi.pdf
    • https://procogs.com/FCKeditor/file/niluvopev.pdf
    • https://intersensor.ro/v2011/Files/fck_upload/file/12504991031.pdf
    • http://kemnhapkhau.com/upload/files/tosikiderutam.pdf
    • http://jafra-com.at/userfiles/file/55414849493.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138357635578---19500912377.pdf
    • https://tauthuy.vn/upload/files/xubafu.pdf
    • http://playitdirect.ca/ckfinder/uploadfiles/files/36765335726.pdf
    • https://rux-thai.com/ckfinder/userfiles/files/katezufiku.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/ofopt7utvqlkc6i28i7k4vn4ri/dotopozeze.pdf
    • https://total-sport.pl/img/upload/files/dakugirewenag.pdf
    • https://hfbee.tw/upload/ckfinder_temp/files/20210905054326.pdf
    • http://huerural.com/uploads/image/files/24410611997.pdf
    • http://demo755.webbazaar.com/uploads/3167230992.pdf
    • https://rainbowprinter.com/app/webroot/files/file/vobizekekefeguruwugedip.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e020.bin
1d134ee03a1ce1be059dea3080e2db6d7cd852ee36138df8d78062f6c32b2d7d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE020 17792 bytes
font_01_sfnt_off00010d90.bin
48d26c11fcc11d25b54d6a5d95229fb78a124858b6058da9b2177e2e6a838271
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D90 10960 bytes
font_02_sfnt_off000126c2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126C2 16792 bytes
font_03_sfnt_off00013ed3.bin
146a7b26443b90e1139447df1cb09ce84126d8382c748950ea743bf34dc7e22e
pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED3 17848 bytes