Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e238b0a04516b10…

MALICIOUS

PDF

84.6 KB Created: 2021-09-13 18:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f1c6e6ef4c8d9ce7f7b88a8d0a569d3 SHA-1: 50ae146c8263ace811265afcf6ba9b8f3a04f1cb SHA-256: 9e238b0a04516b10ad8ea041f493cd09c7848c490461f49affbfbf82414f3b0f
196 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The presence of 'Powershell V1.0' in the document text, coupled with the ML classifier and ClamAV detection, strongly suggests malicious intent. The sample likely serves as a lure to download further payloads or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • 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://kaptenhoki.com/contents/files/46749027002.pdf
    • http://voyagevietnamlaos.com/hinhanh/file/vowutofikoramunajobux.pdf
    • http://modra-skola.cz/userfiles/file/popifevigagerizomowoxiso.pdf
    • http://urbancollab.com/userfiles/Proj_Name/files/34044695345.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/f91e0371a20b9e2ade7509035ed81f3a/72726721259.pdf
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/58956569846.pdf
    • https://rowadalbyt.com/userfiles/files/dubopexozinar.pdf
    • https://asmitahrgroup.com/ckfinder/userfiles/files/rebojusejuvumo.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/ulqcauk3fv31dgfmtocuucp8fq/zujuzotifof.pdf
    • https://jordanadams.com/ckfinder/userfiles/files/56563186654.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613623eba2e19---50213644471.pdf
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/6236507145.pdf
    • https://nezrenpin.com/calisma2/files/uploads/87370070118.pdf
    • https://vjlabor.pitscovn.com/uploads/Upload/files/watirabidopudo.pdf
    • http://gruaszarate.com/ckfinder/userfiles/files/kalutidakirixiwida.pdf
    • http://wish-pharma.com/upload/files/serilu.pdf
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3483168202.pdf
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/kumizoni.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6277d8eca---48080804288.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/cb1545af3acdd6ca2024ef0a61e42a82/mitagorozurisomazirezu.pdf
    • https://autohausnschmidt.de/userfiles/file/nutuvatudetikudexaninaber.pdf
    • http://fitviewer.biz/files/file/pesiwazawataraweb.pdf
    • http://studiocalderini.it/userfiles/files/zajip.pdf
    • http://grandviewgroupresort.com/upload/files/deramagevitamegugazan.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=imo+apps+for+pc+windows+7
    • 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_off0000e374.bin
214650b03e2267cb34ef86d1de37dfea51c4f95ac16b314fd1c9dfb0ac112e1e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE374 10592 bytes
font_01_sfnt_off0000fbb7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB7 16792 bytes
font_02_sfnt_off000113c9.bin
be6c17734e96cd932096f498e9f87cbe13af7fab79121d3dc61aeabba870578a
pdf-font-stream PDF embedded font (sfnt) at offset 0x113C9 19240 bytes