Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f18cd803375273…

MALICIOUS

PDF

73.0 KB Created: 2021-09-09 11:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 16714b82dbeae13259e1991626b6ee4f SHA-1: 894f6fa00d3417669e56dc323ee0f6adf862a184 SHA-256: f1f18cd803375273afc56487676e7113f333d5ba651e1e56aa73fb68c67f52c7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, but the presence of numerous external links indicates a lure for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://myhomeinparis.com/userfiles/files/57458795764.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16130663f99828---77113544316.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/2501eea2bebbf0d4470b34907cc4e31b/86918209760.pdf
    • https://biothiennam.com/media/ftp/file/91451080252.pdf
    • https://jnnjhansi.com/userfiles/file/70338423135.pdf
    • http://poaglasses.com/uploads/files/202109090814294437.pdf
    • http://cck-brno.cz/ckfinder/userfiles/files/43498038612.pdf
    • https://daqing-jewelry.com/uploads/files/202109031655477467.pdf
    • https://inprovitbrasil.com/ckfinder/userfiles/files/60995992720.pdf
    • http://mikol-styl.cz/userfiles/file/72104493883.pdf
    • http://pphjako.pl/userfiles/file/36236740993.pdf
    • http://droneducational.com/admin/userfiles/file/nenusij.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613808f9236b7---wiboxuresilarubalata.pdf
    • https://mingyi-lock.com/data/file/userfiles/files/27745023664.pdf
    • https://rumputhijau.com/contents/files/43120201046.pdf
    • http://www.tamtrebinhminh.com/public/files/tafulivobexi.pdf
    • http://studiotipaldo.com/userfiles/files/lemal.pdf
    • https://prcomponents.com/ckfinder/userfiles/files/54158675486.pdf
    • https://mimpiindah168.com/contents/files/44189472577.pdf
    • https://selispin.com/calisma2/files/uploads/nokijosu.pdf
    • http://rotarybrescello.it/userfiles/files/93601635360.pdf
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/jeponuwagawaruwusawed.pdf
    • https://gites-les-bardots.com/userfiles/file/10679737892.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=the+king+of+fighters+xiv+apk+download+for+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000baf7.bin
ab6681b449b8888b8a06898e952d85506128bcc8974531648e69c754e857e36a
pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF7 11084 bytes
font_01_sfnt_off0000d4a2.bin
c3412e02b26dc53d244c4978f9c5f2a71f764f09d3bb7d9468750649a9385603
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A2 16316 bytes
font_02_sfnt_off0000fe01.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE01 16792 bytes