Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd65ecaed5ecab0…

MALICIOUS

PDF

88.4 KB Created: 2021-07-26 00:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e2ba5f0fee142d5f5c102c567a60f957 SHA-1: e8d764dc10a62e23d7bd4348e2fba15aeb9e37ab SHA-256: 4dd65ecaed5ecab0b2dc9a92bd0526da7c69c9de2105a31189522e387d8a845e
164 Risk Score

Malware Insights

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

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious payloads. The PDF also contains numerous links to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The embedded JavaScript likely attempts to download and execute a second-stage payload, contributing to the overall malicious intent of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://agrion.org/upload/fichier/6424922510.pdf In PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/viratedixefak.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/falimivitawunevomunokus.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1285a5e1e---48045055983.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/3a4b74846ac62b77f33046a029d8e8ca/lusorizebezunux.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b45706be473---51703513337.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/39356988610.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c7b7c3bdee82f812a3ce9fb779dbe759/lutigojisasenexe.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/47308998920.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/xevonefatekiriparafifafek.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/zowojalevugu.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/6e8b3a46d566534c7ab880cf8b45ab13/xovuxutubajakirosuvaz.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073952ba5717---35684931971.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/1ef559c91e35c6be70f01b9cde34b8db/62629965018.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/65846810128.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084193a05f86---bafiwowes.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/66691378507.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d460b98cf342244d796ce25ce3ad6b03/20664380311.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210502220248439.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/4bf03ec5dfe2cea445bf696ac166489f/93886093460.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/walovadu.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/48675638539.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/6825904163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=venn+diagram+template+3+circlesPDF 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_off0000f8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E4 16392 bytes
SHA-256: 2f1a1f0714e4655ca78f1b8d358e64d7dc32c83a3d957616758f4076951d5bf0
font_01_sfnt_off0001234d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234D 10876 bytes
SHA-256: b0974acdf6ad375cf2ca1f8b4b1b486640b4290e54e6db0ca98617198432fbac
font_02_sfnt_off00013c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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