Malicious PDF — malware analysis report

Static analysis result for SHA-256 67aee6c7fb8f8f86…

MALICIOUS

PDF

123.0 KB Created: 2021-10-25 00:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 78b7f159169821c7f5875557f367b08a SHA-1: 533c7efd00d83602c63ca94eb43928c25ad97759 SHA-256: 67aee6c7fb8f8f869d7639e8f5a25691b04ff8fc39b1ed33229978500c27980e
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of external URI heuristics and link farm indicators suggests the primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://ecohouse-lab.com/userfiles/file/sofuzoweda.pdf In PDF document text
    • https://mastirz.com/userfiles/files/savuzotemenoro.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161716c7504fbf---52292444870.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/35228900824.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/48298293374.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/13791495431.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/resetugosilanedut.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/pikogetumikode.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/sujajavisi.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/nijilagewesatofapisemip.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/46563568822.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/xoxifivinuw.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/ea1d0cbcab39ae36defba1343a21b1f6/88339250913.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/28388953065.pdfIn PDF document text
    • https://desmar.cl/gestion/admin/images/upload/file/sixiwexegoberugud.pdfIn PDF document text
    • http://fencefactoryny.com/userfiles/file/83326175370.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/loxupabad.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/52153763574.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/pedasikasowifexeg.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1616b5025c7d2b---zorobedovemivenatatewo.pdfIn PDF document text
    • http://dharkaninternational.com/survey/userfiles/files/55607092482.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/jasitepaxa.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/98849986286.pdfIn PDF document text
    • https://maviet.vn/upload/files/zaxumoguvojebaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/UsNeCLCzgYg/uplcv?utm_term=religion+yahoo+answersPDF 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_off00017795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17795 10532 bytes
SHA-256: 3afc73d364a541656a2ae5aa73ea832c93a4ddd1554d00cfe26ee51b8f25c397
font_01_sfnt_off00018f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F89 20864 bytes
SHA-256: 2f1ae9764d4c7c76198e32591412a3b27b0f7dc279f6526e942d58526d37eb3a
font_02_sfnt_off0001c5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C5C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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