Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fae77af0256c2f6…

MALICIOUS

PDF

78.2 KB Created: 2021-09-12 20:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dbf22e32e2657caa50e732d18cc0a35c SHA-1: c76919a786e0c291925625a5dca68a283fb645c2 SHA-256: 2fae77af0256c2f6c415d57334365c62c78ab1f2c6ee43b54305ac62b714edce
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to numerous external URLs, many hosted on potentially compromised or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a malicious intent to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://csc0516.com/userfiles/file/20210903103209_1lx2zx.pdf In PDF document text
    • http://eperon-kochersberg.com/img_db/13112249227.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613929dca7bbd---10999162037.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ait34apa0hrolfrh3rmqdskbo0/fafow.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/85393629046.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/vedorebusesazobopigaxu.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/tixufuvakosolojim.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/lanijoxoxikozututikadu.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/taleruxurejutikinupadoku.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/61551175943.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/40799241008.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/ludutuwesuz.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/1311854182.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/sidamugilelebovimolekabul.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/1470832071.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/naxubosegebor.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f9ca252fb---65958990901.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/dajewamudaduzipun.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/34637238835.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/26158854995.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aed586f890---miweg.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3b4ab1856---badanevidapuzusitok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=chromecast+app+for+iphone+free+downloadPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/funokimukerijuzelosub.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/jazovesebokedak.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_off0000cb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36E 11000 bytes
SHA-256: 23b681e34b3027e71f218a6e9ff8df2adddec717a15c7f961ad6aa60584d9f00
font_02_sfnt_off0000fce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE5 17824 bytes
SHA-256: 5156799db67417e5bc1df7b606d626c41a2c7c8b801667e564c19b3ae5cdd173

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