Malicious PDF — malware analysis report

Static analysis result for SHA-256 816eb8ef488a5a98…

MALICIOUS

PDF

71.6 KB Created: 2021-09-19 17:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f6f334e3b53f372c9a86200bd749a9b9 SHA-1: babaa22b0a33f2c4b69a84cbc8208d05eb34e1fb SHA-256: 816eb8ef488a5a98342cb4d5b9acbaf6c6224710ca0ab729d8fcc6c0458c04ab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, including links to compromised CMS uploads and disposable hosting, suggests it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=cut+the+rope+apk PDF link annotation
    • https://dcoderesearch.com/uploads/91679773736.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/futobofekajajesadutozuz.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/nudisemamot.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/36379991753.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/ranomejon.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/68026533656.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/teroponinobasuzeb.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/f0028fc2656a7c21564bfd43929fa93f/fivudetaxe.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/93173448399.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/lonuf.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/35258779772.pdfIn PDF document text
    • http://liily.jp/upload/file/20210909091123.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/mevokumonavibid.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/potetironuboboz.pdfIn PDF document text
    • https://tekmaker.com/upload/files/nujibesi.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210913205810_mse8jf.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/83971784454.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/55125464253.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/tetepopibabideveva.pdfIn PDF document text
    • https://finliz.lt/i/File/ditotapaje.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/209d8850501139b0ccbdb8c7419424d2/tekafu.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/vonazivexiwam.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/naveke.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/45934266473.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/55797661331.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16146c0ef33af9---71228686471.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_off0000ba09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA09 15632 bytes
SHA-256: 879a0466375236e99b1f2da112dbeebaec63657ef8b602b84c0e421ed8ee94d1
font_01_sfnt_off0000e1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C1 10164 bytes
SHA-256: 5933fadafd6c288ee9dbab656ddfc796a913fc01e0d15be1b00ad887c3c9d27b

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