Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb69f6eb8e61291…

MALICIOUS

PDF

87.7 KB Created: 2021-09-12 22:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 05aaefbd98ca35aa97277420c0131186 SHA-1: 8bdbd55892ec0e7a129bf3d1db6d0367dea6e8c8 SHA-256: 4bb69f6eb8e612915d6340caa4c4e3e250261cdbe27e07c46dbfbb5b0d6a9c24
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links, several of which point to compromised WordPress sites and potentially disposable hosting, suggesting an attempt to distribute malware. One high-severity heuristic specifically flagged a link to an algorithmically-generated URL, and ClamAV detected the file as a phishing trojan. The presence of these elements indicates a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/catnpslqp18b92amfld6tdpjn2/zafetuzagaruseraxaxi.pdf In PDF document text
    • http://rasciindia.com/firetech/ckupload/files/47404390315.pdfIn PDF document text
    • https://gdaniec.com/upload/files/xozul.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/13790163828.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/worolibusupomejuboramize.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/varufuzegamibob.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/ferenijeg.pdfIn PDF document text
    • http://www.toptehnik.si/images/99853993695.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b246f0a565---52147875677.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/mixazubabakab.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/3gq83tctu607alkst5or8a5090/4747291407.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/bijim.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/40879568102.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///65448713986.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/pisixezim.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/363921581.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/nogigibazewajo.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/tiwikebusex.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/resuk.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/vanigogomugemanowezeture.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/lefuz.pdfIn PDF document text
    • http://servmed.net/userfiles/file/34347384936.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/jozotisivaf.pdfIn PDF document text
    • http://geraldinekilkelly.ie/67846849322.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/80158170609.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=gta+auto+5+download+for+androidPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66E 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_01_sfnt_off0000ce6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6B 10404 bytes
SHA-256: 89579b4746efe6f7c9bf0828782dc96ec16f6ecebf203e057d6026b81cc1bb4f
font_02_sfnt_off0000e630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE630 24364 bytes
SHA-256: 22cc8eb9786ed4cc15f6e08b6a07421e13d16f50583a18b3b69b4ac3a26fc47a
font_03_sfnt_off00012223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00013a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A34 16160 bytes
SHA-256: fa5cbea137587b1d4bb1c548ff3f8d17a18587fe273de630a8d80f12e69f99e4

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