Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c170d7aec09c281…

MALICIOUS

PDF

79.7 KB Created: 2021-09-05 10:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f7350ca815046996aa6efc66cc02ead6 SHA-1: 505fa85cc261a77ede05b1300c570cfcca265095 SHA-256: 4c170d7aec09c2811e2bd8663c46a27e12b9cff9370c7d9ebabec69d83412d8f
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farms points towards an attempt to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32d196bd8---44548860412.pdf In PDF document text
    • http://afslab.asia/upload/files/vopunokekodafipavonulu.pdfIn PDF document text
    • http://djapm.com/userfiles/file/58901412740.pdfIn PDF document text
    • http://4yoga.by/pics/files/ramofepel.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/3336860792.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/jevorikokoxavoriluxi.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/52091626310.pdfIn PDF document text
    • http://expresskaliski.info/file/63905011653.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/66992917699.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/wovotamotutowuvugaw.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/c01e74f9bf2b63552b60e52188ce3b22/vitudoruwubujatitoza.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/rowaruditebabejovirizi.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/zuzemuzurexevisavojala.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/73083770648.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/lumug.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/nukobizepigosenuribede.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16085c9e79ddcb---gedejutududunowixixawawi.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/972161398.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160da2d2658a43---nofuwuxuxedoxigage.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160abceea0c3e6---nejapal.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/gekonivogufetozejisopel.pdfIn PDF document text
    • http://namngonviet.com/user-/files/lipewerukijepusaxikoroj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=objective+questions+on+computer+networks+with+answer+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_off0000d05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05E 17736 bytes
SHA-256: 852b2715e07ce76cac1505a3b0cf53a50dd6939c3a885b92e124308ff59da7ec
font_01_sfnt_off0000fe17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE17 11624 bytes
SHA-256: f61cdb5789e20e9cd445c3f7b9a3d3f2a6f4ed91fccd9753b2885e3a6e0ad9ea
font_02_sfnt_off00011932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11932 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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