Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cc53d782aca9c0b…

MALICIOUS

PDF

94.4 KB Created: 2021-08-07 05:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 445159d3173aa1b2f1a56271ffbc93d3 SHA-1: a14387c147515cb93c512e5ee6e155843190e239 SHA-256: 1cc53d782aca9c0bf841fef84754214519697aca09a7d28c1b7b5f840fa1be28
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage, suggesting it's designed to redirect users to malicious content or download further payloads. The presence of embedded JavaScript (T1059.007) and the use of compromised sites for hosting malicious files are key indicators of its attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fa5e17bc1---90417766905.pdf In PDF document text
    • http://capital96.com/userfiles/file/88353997706.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/gakatetejexixamam.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/67656215512.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e8741b589---kojipofujojofexuzusuru.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///wanoxulekoloj.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/60961189850.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/4300a8bb7ba5cff489cd80901968bbdb/37093721874.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852dbc601f4---linavakovuraxobib.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/18130213756.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acaf058d55---vorezos.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/jekuset.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/lavabafu.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/899fde0dd400210f1243b17041206e3a/55306143894.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/dimipisopoxumetup.pdfIn PDF document text
    • https://facades-metal.ch/ckfinder/userfiles/files/fubunikafoba.pdfIn PDF document text
    • http://www.neocota.com/fckimages/file/dumavetisexebek.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/pefubupalemetawebobado.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b11463542---xovokenikevog.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/4krb39lb13r5hdk4780ii1buj4/38841456603.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/7cbfa39dacaeac538a6914ca381ffff1/kejox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=properties+of+real+numbers+worksheet+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21D 16676 bytes
SHA-256: f2e9d26348091c5e5fe07ca395b1c91bab48814864eb507075919f5f7949db38
font_01_sfnt_off00011db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB7 17760 bytes
SHA-256: 9a3a2e18459fa4cc965c9575987a707491d93fa649533dbe92c1350a28a6859d
font_02_sfnt_off00013904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13904 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001511b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1511B 11044 bytes
SHA-256: f70c1c7bd14288ece3577a6b25acab7fdbbc82334084daf9e37acf8eb93d9562

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