Malicious PDF — malware analysis report

Static analysis result for SHA-256 689b52e519ce869e…

MALICIOUS

PDF

81.1 KB Created: 2021-09-02 22:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e3a57a0c6c514a5ca7c11f05ae745388 SHA-1: 4e26bf84854eea62fdd16feb2a5acbeac2f261bc SHA-256: 689b52e519ce869ef93e8d08a889df5e0a4bf33523a82716eee83b13b62bc008
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely contains instructions to decrypt a password-protected archive, a common tactic to evade security filters. While no scripts were directly extracted, the presence of numerous URLs, some pointing to compromised CMS uploads, suggests a distribution mechanism for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://ehomeforeclosure.org/images/file/83769585363.pdf In PDF document text
    • https://108pizza.pl/uploads/userfiles/files/99280256781.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/kepadatote.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/gkqlo340glasnkhr0759l4li6q/vuvesumifoxuxuluzudiz.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/67592500408.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/38759112543.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/botunilaz.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload//file/tawusekutan.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/18606402153.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e8bfe962a---17869724765.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/jatefedafesi.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210715133507.pdfIn PDF document text
    • http://drhkltd.com/upload/wadinagajanonogusep.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/ofvuqq6qgbv62d4tf7c3165jvv/govunedo.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/82220261145.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/07/20210714080724.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/silakotumozisolojufinosob.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/toxizexovuguvo.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/f5b4a2e880c85e122aab0cd895054770/46450265707.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/kusemitanebulowubelevavur.pdfIn PDF document text
    • http://sunnysidehigh65.com/clients/d/d0/d00d1ad1640c45b888f5e58ac216a5d1/File/davinegebixelabekiwi.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16099f7ae8be8d---xekexikajo.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/zegiribenojexeba.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/dogagugav.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/sjauco748h6p5dvc3cvtg5s00m/87209995101.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=rotary+lift+installation+manualPDF 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_off0000da64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA64 16984 bytes
SHA-256: c971776ecdeabab50231e194a52ecbbc2f4dafc0b621573bc4311526346d781e
font_01_sfnt_off00010697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAE 10500 bytes
SHA-256: ade0e8ecc425dea1c33d87d1563f45344a69bc0c42cfd175b69f36c8ccfbed9a