Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e52c62ad82926f0…

MALICIOUS

PDF

102.7 KB Created: 2021-09-06 02:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 471e074bb46b23e903517656dae528ab SHA-1: 5521f552ae552e33793b878cfc035a82f4418565 SHA-256: 8e52c62ad82926f01c7951646e463ab1d77d1bceb6cf0a03b4ae9c3b020b4451
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common malicious document distribution technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smitheaster.org/clients/861344/File/xerobebimobikukin.pdf In PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609409685a70e---puvebaropevaxudebemum.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/13209018374.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/45069286786.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/f1ff299081800f7f4769a69f870e5e7b/jador.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/40930373165.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/xosikeneselun.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/solopadevov.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/13508583848.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210616112329_vjrmpf.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/50598056201.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/80018245626.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/mibewujumizi.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/45079468739.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/62041705857.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/kapotiwopagaxok.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/sejezelan.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/19010430983.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/52421231edadfc12bd47d0dd0f617d41/wikotejiradixalufeb.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/matitegebizejara.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210609163149.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/vufaxebewunofizini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=crompton+greaves+lighting+catalogue+pdf+2018PDF 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_off000128c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C7 18180 bytes
SHA-256: 77a31349a62922dbc0e298bb7881b737cf843f6aea43b75ecd8c1a78065fd304
font_01_sfnt_off00015898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15898 11764 bytes
SHA-256: 05f068807e349ebda9e6006e586e22bf9bef205cd760f04acae8e4f7f4b8b8f5
font_02_sfnt_off00017472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17472 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1