Malicious PDF — malware analysis report

Static analysis result for SHA-256 84073fda3e058450…

MALICIOUS

PDF

76.1 KB Created: 2021-09-07 12:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 61953c19cca9ab9b9674068b09b3e0d9 SHA-1: 4ce6476b8b7eac610125ff7c5e7ec48b4af0f105 SHA-256: 84073fda3e058450538a4d362cd05570f349c2da2d01e31dd9b0d43668927a17
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • 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 https://anctools.com/ckfinder/userfiles/files/1992813292.pdf In PDF document text
    • http://ceramvetro.net/userfiles/file/darenekajokamepadoxiwup.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/c4af8305024509c70afa1c87900c0a29/kepunatidutebexe.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/wozitevu.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/kerunadakesefitulokuz.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a98e76406---xibekixo.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af9d1481bcb---85126696591.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/1445222528.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/2119016614.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/53980715085.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/legopa.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/59717455436.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/70baa76b3ddf1052bf756080b3cf3965/6514540767.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/dulevolaxonitekuzo.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/853209224a373f9e224038d4d5b4c142/gupisinolazozaxasozokole.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611cf53a02f70---33458546713.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/lakix.pdfIn PDF document text
    • https://aaaxxion.info/images/file/25303553491.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c34db97d594---dekalobeguzate.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5fd016934---14112672172.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/77367915157.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab76ac77ddd---1204054033.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/wonubozaxaxakebaravazi.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/wuniruxizatoxude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=jurnal+pengertian+hedonisme+pdfPDF 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_off0000c2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DA 11036 bytes
SHA-256: 033b2e7c54a56ea10c92a51f06e406ebde9c4ad5c5f0a8cb89882aeef4d22e87
font_01_sfnt_off0000dc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC17 17864 bytes
SHA-256: 8cef8a3b3f38cf2675b2f3ce56382799230767623d9ab8f13423cb6ea73572cf
font_02_sfnt_off00010aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1