Malicious PDF — malware analysis report

Static analysis result for SHA-256 568b48440e1a3884…

MALICIOUS

PDF

68.1 KB Created: 2021-10-01 14:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: ce84e084c774dd8005c765594a8ca9f7 SHA-1: 3e2c4b15de0392981fb5e9765cb216c6135af312 SHA-256: 568b48440e1a3884a386e73440ba39603dda3b6ba89858002c2fec726a0092a0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised WordPress sites, indicating a link farm designed to lure victims. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript, though not fully analyzed, is a common vector for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://wamer.org/userfiles/file/44638240978.pdf In PDF document text
    • https://ms02bet.com/contents/files/zejebagiditakow.pdfIn PDF document text
    • http://kusistoconstruction.com/userfiles/file/sifutunurir.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/79197132971.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/32068360085.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/42800271769.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/b6c743104fc2388c0b7ea132a6be610e/56777501131.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/satexavomel.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/xepenan.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/rujebasoturof.pdfIn PDF document text
    • http://origo.ws/userfiles/file/damubegekiworijileduf.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/natogagiwapibusewag.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/8427542852.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/fakeribubawaxapinofaga.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/28556602141.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/969262c8291f23875318b1a3d0e18f34/39755677481.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/jozoka.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/76333516826.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/sinazudoremitaboxujirise.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/77745461201.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/14840108794.pdfIn PDF document text
    • http://silver1979.com/upload/file/pegud.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153cdab01d54---larozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=redmi+note+10+pro+pixel+experiencePDF 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_off0000ade5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F7 14648 bytes
SHA-256: 76f92145236e3c95a877f026cabaa3e0b2ca8587b555b1f9b85871c7be6f36cf
font_02_sfnt_off0000ead4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD4 10664 bytes
SHA-256: 8bae354693b2f5cda5105de172740f76b8b9638312fd7960fa35ad1f41fd77f9

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