Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb5670c23e623957…

MALICIOUS

PDF

101.0 KB Created: 2021-07-21 04:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f0ec5fedb215b3bbf92d84cd70fdf854 SHA-1: e00fbade3fa2cb92964890fce63ece496973d619 SHA-256: bb5670c23e623957f419b925ab9604ca303d85cd0270a4bd38b62f60548d982e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document contains numerous links to compromised websites, suggesting an attempt to host malicious content or redirect users to phishing pages. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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://ktmcollege.org/public_html/userfiles/file/molelepawune.pdf In PDF document text
    • http://hocikto.info/userfiles/file/31464352201.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/39211034440.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/33946071302.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/diradogoguzuj.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160783a13d86a7---xekusekizalerigazemoradef.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c078368e863---nukelosapenudibixi.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a9791882dba---9421008411.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075b7ab2055a---wolidikod.pdfIn PDF document text
    • http://rotang.net/userfiles/file/zanoxawinozipikobilibug.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/fa1pg499q3af9fi7a1nligkfui/tikiwatixezukedoluwumo.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/roxobojiwatusupimodelisa.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/1c2e7c3773702eeb4bcb1d5f0a5fe6d4/butatopokitex.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/zeritabilukajozobuvibide.pdfIn PDF document text
    • https://tjpapigroup3.com/contents//files/68283532132.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/zebumuvijidowepe.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd317e9cf3---60313179848.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/23917223885.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/68994748113.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/ebc35fdc77d17650ae142d15633156a2/85793727347.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/xaraki.pdfIn PDF document text
    • http://consade.com/userfiles/file/zukirux.pdfIn PDF document text
    • http://dchs80.com/clients/c/cb/cbc185099defa3274d3d4f74835fd64f/File/15942514839.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/45249182527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=mp3+download+dance+monkey+by+tones+and+iPDF 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
stream_003_off00010635.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10635 21012 bytes
SHA-256: fa79e6a66bf2a84eb4ec9bc5e75e7bdd7a5c00b4bb7759dab33e8856edd24142
font_00_sfnt_off0000ee24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD8 11172 bytes
SHA-256: c18049f7204a90ff25029be9c533c846018fddfa730ff979f5d7a761c479c8da
font_03_sfnt_off000144d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D4 26060 bytes
SHA-256: a234b77c4f8777263cf9ee1c3b298a961113aa82a08df3493ab36531406628e3