Malicious PDF — malware analysis report

Static analysis result for SHA-256 da61e924ade249c6…

MALICIOUS

PDF

86.0 KB Created: 2021-08-25 03:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 7b2581e5c925d0d3e868345d016e3fec SHA-1: 21d5a2ee5ced6b23e6d4bd9b78db8f1c73295672 SHA-256: da61e924ade249c60c60e3e351e9610818843ad1a29dd0678b4210866d7c42f0
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/37d324dc6dc2518de4debd6cc3f7ee8e/belizeguzuwamom.pdf In PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/ruzanixozejetize.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dd761e14b9e---70912866654.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/99054780234.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f7386d6a7---40528276414.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/5d3454f7ebe5466375c7ea80e78d78e6/laginorenodod.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/e06640c48547bbbf6c0ea8e0a1716f4b/84896465843.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/85358724534.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/29edc3e9247820e51fddd02242d5a43a/68203159829.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/pekevatagebilu.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/61f26aeee6ae28921fc6906a59af3ddd/vunubelojadatelus.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/48132906177.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/82259607995.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/7caff5914332e692fb180e449aa97876/tukafopevarumazenowowama.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/98fb854f8ce820e1b91d771babcbbbbd/78747090284.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/6f7c84ff6f1c5f8e66c14961137a4bd4/diwudumulobixemavi.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093c65abdb90---701800226.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160da80c619a0d---rutonafijen.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/d48sl8vfdap4us71qrhft6h2a5/6083164436.pdfIn PDF document text
    • https://murten-hotel.ch/userfiles/files/91848254142.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/palozizegujevodaxagegu.pdfIn PDF document text
    • http://unseretochter.ch/images/file/67841456043.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/sudozabukodikumixif.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/47297994990.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9e4c411ff---roxujefurutu.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/a9e64fe31befb2aead5aa38eecceecaa/jedumamigojoba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=white+patches+on+tonsilsPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2B 16688 bytes
SHA-256: 95ae0e7dd3ceeae0f5eb7d4adf30cc59eae1047aea57b27df3dfdaa75339de12
font_01_sfnt_off000119a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BE 10364 bytes
SHA-256: 55944c81ea18d855616e9a3143dc0fecc52b58fecc9ae7c9bf546ff4b17331cf