Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa42eb43952485ed…

MALICIOUS

PDF

78.2 KB Created: 2021-09-10 09:38:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4823777607af104da07b981fcbef7822 SHA-1: ec2f679f420fd02e154f6e0e63ec6bc37de54ae5 SHA-256: fa42eb43952485edefa415b7ee9675312deecb0e5f0269a7bcc17159ac9838bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple distinct hosts, indicating an attempt to redirect the user to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript (T1059.007) and the nature of the links suggest it's delivered as an attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://fotografoenricogiampieri.it/userfiles/files/zibetinanosajonub.pdf In PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/jg3rif9b1ecf5l53da3jhcn9if/runozipebikojazafo.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613a77f736390---97595877695.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/36062469680.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/bunevomiteroze.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/11923673304.pdfIn PDF document text
    • https://hsse.cl/files/fomelov.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/kuloled.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/vasajafere.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/kugavikikavukodup.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/xugexekunat.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/zezurem.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16130e83ab61b9---suzekezatofodibuvurisala.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161381db85fd69---salabufixobivebu.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139b4ed927c9---16190800040.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/43393678986.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/61042835028.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/9553088810.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136815febd59---batekepumelanevan.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/8419897433.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/rigefejuzuxikepamewuf.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/62784121395.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361b92a9e15---guwalovogapowaxogaju.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e027ebe86---39418630753.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/75005919064.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/xiwetidiwasodagagixobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=geometry+dash+hack+iosPDF 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_off0000cbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAF 10732 bytes
SHA-256: b4df6e60efaeeda9730a5e504c586dd47b2b7af253b83efe4de64a24e950e76b
font_01_sfnt_off0000e46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46F 18048 bytes
SHA-256: 4523ec34c6229c06786aea3b046b0a9a86979e73e82205d2351ed90fca636ff2
font_02_sfnt_off0001138f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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