Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aca09e87e61cd1d…

MALICIOUS

PDF

84.2 KB Created: 2021-09-01 04:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b87cc7e56ac717a3dd595a1405d32984 SHA-1: a2bcc7de4bf22d26fc8210d024758787bc6745ea SHA-256: 6aca09e87e61cd1d47eb88d3f8e58a40ff7843e979ce920fb568b0498e7634d2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains a link farm pointing to various disposable hosting sites and compromised CMS uploads, suggesting it's used to redirect users to malicious content. The presence of external URIs and link farms strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://tele-video.ru/upload/files/vijijazasavowaxexulan.pdf In PDF document text
    • https://corpusbg.com/files/fck/file/jomutum.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/5ad4873ccd762d756d75191ecfbb1dcb/jibejuforakagojexarexumaf.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/86358756867.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/69919f6d05c68c4805aa97343305b000/55778279266.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/jafudenimigukisi.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/41680740585.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202108281400131635.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/m4cgopdqa6lhu7fmdvt67bhnln/tetonabetitu.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/49aa651dfc53115e7e023ea819e00826/54079013180.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/77358980674.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1730578f9f---71423837767.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/jujuf.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/raludisoragete.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/54315338044.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/603420f64aa6dcb2c144040304c80a39/mulekenafo.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/mesopujinijadusigolutol.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/wowisov.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/kisepaxilebofevedaze.pdfIn PDF document text
    • https://tavio.ru/files/file/divonabisujulapalu.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/fe583fb9c69d8ea6960e2d894f58ad8d/76828719268.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/jrt8c4ivc9mned8ira6gipcefs/xekivokasasozasuxalurijo.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210815043834.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/limuteselovupujajewitenox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=to+all+concerned+meaningPDF 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_off0000e008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE008 20156 bytes
SHA-256: cd0dd7166149b006aff51db4eb9432029016b6cd9c218d5dd4331bfc57921f95
font_01_sfnt_off0001145c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C73 10412 bytes
SHA-256: 19ebeb6abc352bf5029f0dddff71dc42e5bbce8a0462cd380c20e0f7d9e81716