Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9284a8c88a1b1ea…

MALICIOUS

PDF

85.0 KB Created: 2021-07-14 09:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c2161bf8df8afaf7ee4f3372a6d388a SHA-1: 2eec721659da9d965d0748348d0144b5f08ae3bd SHA-256: f9284a8c88a1b1ea30ee3c6f6ba9c4b2378ac54eae7ba6bd61e8ae9a41c57bf0
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs and link farm characteristics suggest a phishing or malware distribution attempt. The document body is heavily obfuscated and likely contains further malicious content or redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://huntic.ru/uplcv?utm_term=how+to+get+lateral+flow+test+kits
    • http://insidethedigitaltrend.biz/userfiles/file/viwibasaxofexi.pdf
    • http://s-privod.ru/userfiles/file/82860386405.pdf
    • http://murphysbeads.com/clients/54316/File/zojipulabimujebezi.pdf
    • http://kassa.pl/userfiles/file/36317600589.pdf
    • http://vce34.ru/attachments/file/popizadifubajotasepa.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a0253b604a7---mawebanexupojajodoz.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/b157e48a5243b38801fa088dafb0727d/mixawukodazaxim.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/3b30d1fc2575fb15d92da41700c0dd02/gabopuxugiratijumim.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d754d52a77---42093400962.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/098at6d38v7fs0u7ea9pl5f1v6/45361057376.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/ousd2qhbq7ni2uu46a7c0hjte7/15445689878.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/wuxadoxapifusejumesulaw.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0d97f08a6---46631176217.pdf
    • https://paklya.su/design/img/upload/file/faxer.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920769edd53---roxawulabe.pdf
    • http://1utilaje.ro/mm/file/75033402822.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c14c7daef8e---zudovobosixefi.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/f05af7ba0091eac3a9201b3c221136b1/liwikarupojubape.pdf
    • http://bahattinburyan.com/userfiles/file/11203254722.pdf
    • http://mgocsm.in/userfiles/file/bekipuwafeteg.pdf
    • http://www.bash.cl/media/file/xidetuxumazonupufowi.pdf
    • http://teplospectr.ru/images/files/61433249139.pdf
    • https://turbooto.vn/upload/files/89334414998.pdf
    • http://drivescuolaguida.it/userfiles/files/ronenofunojixanid.pdf
    • https://ibeguiristain.com/userfiles/files/41469111328.pdf
    • http://www.lnk-creation.fr/upload/file/63203534915.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9b1.bin
b5c263d85e34faf816623c670409718e77e59eb13d309267685c4a439c19db15
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B1 17212 bytes
font_01_sfnt_off0001168e.bin
6ff1cc855987ab535c61a9936e45ffa7e508261b1ab5bebb9cebaa35dd7d14d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1168E 10452 bytes
font_02_sfnt_off00012e7d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7D 16792 bytes