Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae82688c9224380d…

MALICIOUS

PDF

80.3 KB Created: 2021-09-05 02:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: acaf67602431670113226fd122d2a44a SHA-1: ec1d7d9dcbb07476857e49041274b4dab472022f SHA-256: ae82688c9224380dbdd5ea03657ad4dcd5e6d8e0be6beac9ef46012744eada65
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious payloads. The presence of numerous external URIs, many pointing to compromised CMS uploads and disposable hosting, suggests a link farm designed to redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://german-ex.com/images/blog/file/basisokebetatigar.pdf In PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16080b2882977e---11260595312.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/2211767251.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088d4b101f02---54935781192.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/zikinazogife.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607519775da9d---kunuwuvoragofironovatin.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210725230706_kacp6j.pdfIn PDF document text
    • https://adikketiga.com/contents//files/kapafugo.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/vufikagurudajaw.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161086d52e7496---59644760836.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63bad51bb1---64527173887.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/vukobawikigupone.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/u4q5i4v7mevbpre1ecu99f1sq0/govonamux.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/ch6j8rdeegud2o8ei5trgs73hd/2467972676.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/818f947d87b6c48a1ae03655d85579ff/41260130238.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/jitoxe.pdfIn PDF document text
    • https://unosms.us/userfiles/file/tuzidawipuxavuporupekiw.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160de474e3eef7---xogodonig.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/86451875639.pdfIn PDF document text
    • https://kuepancong.com/contents//files/24686185602.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/62755030930.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/xutexezulew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=wheel+of+life+zig+ziglar+pdfPDF 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_off0000d53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED51 18568 bytes
SHA-256: 4e41f65338e95ed26b11121c6fe068be10e672fb4f10640c4fe690fd3424a4be
font_02_sfnt_off00011c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C28 10460 bytes
SHA-256: 9bb0113ef24929f04c4d7a46b1161883609e2b6991aa22e88a67f3824c66ac64

Open this report in the interactive analyzer, or submit your own file for analysis.