Malicious PDF — malware analysis report

Static analysis result for SHA-256 53be4791338a0ff1…

MALICIOUS

PDF

68.4 KB Created: 2021-09-26 07:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 01cf8c7b723420eb81d36773e735b56d SHA-1: a14f43f1b0e6e4af7e111c6828fdb62ceab6f42e SHA-256: 53be4791338a0ff17bd8a551d6a116825ffa0a79d968ae7b95073d5d39eac8b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which are hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of links pointing to compromised CMS uploads and disposable hosting further supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://queure.ru/uplcv?utm_term=junooniyat+full+movie+online+watch+free PDF link annotation
    • http://artstudiodesign.it/userfiles/files/25982978854.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/wupanaxerebaluxiri.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/fedonajuradopelemidubofo.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/tijalonanekerajamob.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/47402079080.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/kimopiwulalilosumisedezo.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/tugami.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e03566e9cc---12661972345.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614838495d23b---fapinapunitekajerapesewax.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109011517077135.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/tidijuwamu.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/josujufofojuxenekemofid.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/koxisen.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/jowawavoladoxekanifu.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/70365790833.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/tulogisowifixer.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/39416168004.pdfIn PDF document text
    • https://exhibitproplus.epponline.com/mentorfinancial/page_images/file/47517603065.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f8e1352a6e---42261316693.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/kuwikiwamomopu.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/92606721896.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/loniwuxufazupofojutuketef.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614762862eee7---poxobozunefekuxetoka.pdfIn PDF document text
    • 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_off0000af11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC723 14516 bytes
SHA-256: 615eca7d8156fe0f54324ca1061a07c73ee5b126a5d89c15a66efbb4eb8c1935
font_02_sfnt_off0000eb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5A 10788 bytes
SHA-256: 723c1b73475b11d9be1fb71bdc216edfe68afb5f8060f47fcf1087dad4e54c4f

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