Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb37095ceef40151…

MALICIOUS

PDF

78.5 KB Created: 2021-09-19 07:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d43ca8e9b91d65129e737a6c0d10d9cb SHA-1: 123d4d78854d1c7c4117be0751815650390e0bde SHA-256: cb37095ceef40151d67936fc11c4749ea53255378a7cff609bdd2f3882ffe5ff
216 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and malware distribution lure. The document prompts the user to install a browser extension or update, a common social engineering tactic to facilitate credential theft or malware installation. While no scripts were directly extracted, the embedded URLs suggest a link farm hosted on potentially compromised or disposable domains, indicating a multi-stage attack. The presence of external URIs and link farms points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://agama-rc.com/upload/files/7085285600.pdf In PDF document text
    • http://qhchemicalsfeed.com/upload/files/sebanobi.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cffa8cde39---19727241558.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/e48lmr34r6ilekupnli2ngfmvj/fewusogulumozabuz.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/fd8c158f3d5481e7c6e59e26c2aa0db0/kejepujufox.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329bf414fd9---39868843680.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/bigifotenugufo.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/xaxudafovewil.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/fiwinigalomosadetetej.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16141157c75fce---5686217632.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/xoxerisiterovovoninikolak.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/torunuwelenosigutazugarak.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210905194436.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/91417834776.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/67826343998.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/45608148967.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134d64548356---gizigasulabutiba.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/abb78d696e53456f1a82f05d97631676/pasenorevewazogopilef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=android+online+emulator+web+storePDF 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_off0000cdf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF4 10716 bytes
SHA-256: 8ccc971eb6117dd2fead9fd6c9f767bf4292fcff3f1b0f9ccd4aab852e9256c6
font_01_sfnt_off0000e69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69A 17744 bytes
SHA-256: 19e86db51ccf3720f8d594e9ef4fc65593d9c1ea91a9833180328b33aa4a7348
font_02_sfnt_off0001149a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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