Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e4a17d36dd9c2c2…

MALICIOUS

PDF

70.6 KB Created: 2021-10-04 08:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8e12a3f696622dce915025429502ff6c SHA-1: 914e16d4df8eddaaad38edff740e8a336c43c673 SHA-256: 7e4a17d36dd9c2c24a7f5219ef70408b70b5af4c5625b92c16d4d128572d0808
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous external URIs pointing to various domains, many of which appear to be compromised or disposable hosting. The embedded JavaScript stream, while not fully analyzed due to its nature, likely contributes to the redirection or obfuscation of these links. The primary attack pattern observed is the use of a link farm to lure users to external sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=bengali+boy+names+starting+with+r PDF link annotation
    • http://veterinariacasettamattei.it/userfiles/files/zubolowuwubimodu.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/46431100493.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/goguga.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/21a2271e30bec0a6453e393a76ff1cfe/jewivomekenuvoj.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f67d48317a0d29713eb9ec62d3dcdb07/liketixajamikodapuronixub.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109181136573994.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/metuxima.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/64058246005.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/dbuprb24cahvgj2v2c4qpvb5qo/lidiletemeduxubokirasuxu.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/kalizemeraruvalirid.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/991c604a7f654d27b859affb9e24fa57/90284724362.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614839273f31e---lepevagetajotokofuzoge.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/49144008270.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/29617002051.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/57624065946.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161563ebb9fc39---pozabibarapoxofutuwive.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/53825584412.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/22669193532.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/5299967811.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/wuboz.pdfIn PDF document text
    • https://asken.as/bilder/file/wusanovinidevofobuku.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/wamugukigogugiloreti.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/gapifowonidevu.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_off0000af3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF3B 10948 bytes
SHA-256: 9a269801aaeec55de559c27442f3d4516b52df3e23669fd621370ccedd1b1f93
font_01_sfnt_off0000c882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC882 17336 bytes
SHA-256: 51066ebc10a7e338ea91dc3fab4dd8a545225bd307ad8042d9f3a455d3cf3943
font_02_sfnt_off0000f478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF478 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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