Malicious PDF — malware analysis report

Static analysis result for SHA-256 018e879e560d1488…

MALICIOUS

PDF

83.9 KB Created: 2021-09-08 20:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 110ed85c6b9da90129ec2496e7e60080 SHA-1: 8ac310a94f1a277a9fe99ba5a01a01ff17f7e2e0 SHA-256: 018e879e560d1488b6aec48e26626690c36d51dce0eea0ea584ff27a5cd3954b
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. This script likely redirects the user to external URLs, as indicated by the numerous suspicious links found in the document. The PDF also exhibits characteristics of a link farm hosted on compromised WordPress sites, suggesting an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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://huntic.ru/uplcv?utm_term=principales+precursores+de+la+psicologia+social+pdf PDF link annotation
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161379edd71611---7318439772.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/d98c31c0e39dfa457bd628e99da2e452/20297068478.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/12593746358.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/89954545246.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/5307280616.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1seji41p05e640ffv90jaaqiu2/52529789942.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/vuxusepegepozovinak.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/74215762438.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/18725250748.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/49925678841.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/98956647220.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/xitofupuzikebavuved.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/91307206901.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/beburebiwowogosup.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/696815849.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/92677046488.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/mewiwowogoduwiza.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/zojofefokok.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/69962092030.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613566576730b---voxofemuzepafibamobawi.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/vokozisurodowedafaxew.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/89522619600.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/43947097609.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/031540274387.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/denajofatanagimefinojager.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_off0000de95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE95 18976 bytes
SHA-256: c9ff48ea7ff693f86e3f1fe49967c755a478398c69a5a82caa8d93a500ec2ecb
font_01_sfnt_off00010ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE0 10796 bytes
SHA-256: f00353a22ad5fa0856b0de73cfa2f5f20ff960b7bd9bd8eeb266b8cc9aaa201c
font_02_sfnt_off00012793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12793 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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