Malicious PDF — malware analysis report

Static analysis result for SHA-256 409493d060d66dfc…

MALICIOUS

PDF

106.4 KB Created: 2021-08-14 01:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5cec791a6eab4ff37ab0a44bf046823d SHA-1: d1444f026a48819696aee5efae32fd63f4d1b41b SHA-256: 409493d060d66dfc99be2898d66fae84450d95fa758a0cdf3f95df745d0d2c0b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, and it contains heuristics indicating it's a link farm and a lure for remote support tools. The document's content, though heavily obfuscated in the provided excerpt, likely instructs the user to install or connect with a remote support tool, a common tactic for phishing or scam operations. The numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, further support the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pristineleather.com/userfiles/file/weminuvufukab.pdf In PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085063e019ed---tugazabozol.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/ratabepejinuv.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/bf4ed5e6bf2291295a712326d750a2fa/59839053813.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/53866590000.pdfIn PDF document text
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/9lgdbj560hl7fqacgipc270o7t/mizusifanobomalajir.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/wapefojobotigaban.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/ugof7n9f7q0851lm2vjqip72fc/zosemexemej.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/073f27e3970bfa033e31d24e2eee0d8d/63563254712.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/eeafa7a74d6041cfda980014423b958b/17159438779.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/godipetogujup.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/18346892643.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e9d628265---durodedenulewutilu.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/tuwimodokatekobugog.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/91on2dbs51o46988tnh3q9cnu1/52781695393.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/renuxunitarupaxakara.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/75c262aad753d9dcd1f90cee8add822c/20511464709.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d293824d70b---18244930348.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/61482633656.pdfIn PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/fukegixas.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160713c2f34fc4---vuwuxevu.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/87486583856.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/67243045678.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/02ebc7a0fafd01119e2088903b59a0dc/11218882419.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/jatorekibifexokaredaser.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=suzuki+violin+book+4+table+of+contentsPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E65 2464 bytes
SHA-256: c7491b1ebc9ca2e21a00c7fac9d29c0766178d87a694399292ee8e08d2cf73d3
font_01_sfnt_off0001391e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15130 19104 bytes
SHA-256: 6c5288d264607a0a3427dd2ea40c123061fc62fa209d66720a23cf84aea1de20
font_03_sfnt_off000181c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181C8 10840 bytes
SHA-256: b7653bddad43266f609e29a79ebb5d66d8560a5c22e14cc34d0bc3e5110656f5

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