Malicious PDF — malware analysis report

Static analysis result for SHA-256 85cf2a023be992ba…

MALICIOUS

PDF

80.4 KB Created: 2021-09-13 11:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 61905632298b9a450a27f0930b15792a SHA-1: 15ac328108b189550fd571507a5aa0b131d134b2 SHA-256: 85cf2a023be992ba24145e75490f640e12f0852ed93b313321c971871f80ce46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be disposable link farms. These links likely serve as lures to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://arch.ua/ckfinder/userfiles/files/ximibalijo.pdf In PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/revasarifemuximoli.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/28289829042.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/rasutititofopunetewem.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16132eea64e6db---mutitupi.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/daserebasefogoreginu.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/wasiwavolazede.pdfIn PDF document text
    • http://designgaleria.hu/userfiles/file/tipapalivosatipopi.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/sipupujotoxilujubazogose.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/4366270b4ff23e66ec16d4be8c261fc5/duxewaburonezexotur.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/tibusuzuwubowilukuf.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/9f413a91b5c4feb421b5aa1c7d1ee3fe/9099317417.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/zosazakegisixozowojatosin.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/lijatumazolexesig.pdfIn PDF document text
    • https://nyig.com/files/file/33970990183.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a279720de---wuvenimedakosajavamitadur.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/2nk2putncsm9tnj4m5pkt8gdf1/pameziwuzekeranuvokod.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/gijegamubemolemeti.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/49281169335.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/jupevuxugib.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/sutefakazivonifoxalapupo.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/rixobuselinef.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/47698684916.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/vereliboriboz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=check+mobile+signal+strength+androidPDF 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_off0000d313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD313 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB25 18196 bytes
SHA-256: fbb08f78f77eee2dac676f7a04199dd7116703d0112ae388683db60356436041
font_02_sfnt_off00011a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A41 11080 bytes
SHA-256: 4b81ba0013df0df0c25a5fc93a792a7410c68d7abae28d40e56a52e612f27ce1

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