Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f55fcc880bb9d97…

MALICIOUS

PDF

69.0 KB Created: 2021-09-25 10:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fae4ae36894fa37ab33f221ac8d31812 SHA-1: e5943d3ae8bab660a31c27c55ac0553f2a2407dd SHA-256: 1f55fcc880bb9d97456f26a638d5aacf5248578c1196abc721b863abefdb10f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://synerhu.ru/uplcv?utm_term=mcoc+god+mod PDF link annotation
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/wurowetemulom.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/71004392186.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/luretitujijudarisitim.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/53092731196.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131b7b844d45---83328822584.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613953840765f---wutuzironivevezigoxuzaza.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/danewujinazi.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/15396533269.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/zazaxowelowarukurot.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/93906443283.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/62632281942.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/xotuxavapirixulodu.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/gukexobijumupepow.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/75367557798.pdfIn PDF document text
    • https://themalc.org/files/file/89862382732.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/wajowagasexu.pdfIn PDF document text
    • http://opersan.com/file/sinozamabebovafo.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/malurokasu.pdfIn PDF document text
    • http://snft.ro/media/file/numenukitumewijev.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/20426090191.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/4698039007.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e722712948---sevurirenedidutis.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/nimazapufizatagibumup.pdfIn PDF document text
    • https://italvaping.com/file/xadatejixuwema.pdfIn PDF document text
    • https://777mto.info/contents/files/47404520300.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/11497415438.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_off0000b1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C2 15664 bytes
SHA-256: 613216f944f0dbf9987f1587e6e2c23a0e1f69611c30aed40865764fb0b744b0
font_01_sfnt_off0000d98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A5 9804 bytes
SHA-256: f46a446948c79d5597d4067996d0a8a37f8e9a93541b8b5fc279431ebdd8260a

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