Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ad99f4a09a6a456…

MALICIOUS

PDF

109.6 KB Created: 2021-06-26 02:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3960edf591ca74a8205fd5a12d7c2d9a SHA-1: 4f28062ffb1abbbd4ed0de7a721a5e57a019414b SHA-256: 1ad99f4a09a6a456d3ba75c3fb7ccf4fdb4acea7b90f3d7a2a23bdbfda545c02
236 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document instructs users to install or connect with a remote support tool, a common social engineering tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading and executing a secondary payload disguised as a remote support tool installer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://irlanc.ru/uplcv?utm_term=hiren%27s+bootcd+15.2+rebuild+all+in+one+bootable+cd
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160960f1b5c68a---pimuposizikulevegab.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5f04e1d73---popav.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608da5be889d6---pukowipedodekezubufusek.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e4f7c9693---rokijajufub.pdf
    • http://graham1978.com/clients/79565/File/nojoresujakifuxi.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2de5ed910---13066568973.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/0eqcmd5kprr2tv7d2c0lu39qtk/jimuwim.pdf
    • http://gasthaus-steinkirchen.de/img/editor/file/72644998034.pdf
    • http://alfavs.eu/userfiles/file/xoniwoxorur.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c344c8f7c---sejufiloritopalir.pdf
    • http://zeguvietnam.com/uploads/ckfinder/files/53605610655.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/abcl6gld7gt70pbdno3dei967k/28578515742.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608373dbdc6cf---92004321547.pdf
    • https://planet-pvc.com/upload/files/68238613893.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16089c1087c51a---5701509037.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609408d0ea3c6---linolamufixaliv.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0601d841f---kasitepes.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5814daa9f---71228956747.pdf
    • https://ancoraeducacion.com/images/1321892421.pdf
    • http://seoulsquare.com/userfiles/file/48638824725.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1fcc7716a2db7b4bfa10b3bb2919e79c/wulakivonaruxagipakix.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce6ebee1e0d---16822406007.pdf
    • https://edarky.net/data/file/runetarepejavozugukebamaj.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c03b273d0---46966813536.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/e07a580b2d86beee1a26c5b4942dbaae/33953470224.pdf
    • http://notarbrazda.cz/userfiles/file/24989191641.pdf
    • http://gasthaus-steinkir
    • 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_off00014a7a.bin
b6d70231f88df9e9ec822c62e5fda205291620c421a62abe241eae158dfc5086		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A7A 17084 bytes
font_01_sfnt_off000176cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x176CD 16792 bytes
font_02_sfnt_off00018ee4.bin
edb02428f68087702fe5bc76ce220c17781772bdbfe1858b005fcc97bee2b88e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18EE4 11000 bytes

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